Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf23562eb159afe7…

MALICIOUS

PDF

84.5 KB Created: 2021-03-21 04:59:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 402b5bbf43683bdea5aebbfce63c574e SHA-1: 203a80a7a9666c8a15dada7f08804735ecc8a553 SHA-256: bf23562eb159afe78e1287c57aea91d406372ccf984b8aa44d6f8cfb4ba51785
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution lure. It contains numerous links to redirector infrastructure, including the primary malicious URL https://crophysi.ru/strik?utm_term=arachnid+bullshooter+dart+board, which is designed to lead users to further malicious content. The presence of a link farm suggests an attempt to manipulate search engine results for broader reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/strik?utm_term=arachnid+bullshooter+dart+board In PDF document text
    • https://static.s123-cdn-static.com/uploads/4472200/normal_600241d4b1a09.pdfIn PDF document text
    • https://fowitukusizuge.weebly.com/uploads/1/3/5/3/135325135/4541984.pdfIn PDF document text
    • https://laratenin.weebly.com/uploads/1/3/2/8/132816160/776850.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/ii8kqgj/samsung_galaxy_xcover_4s_review.pdfIn PDF document text
    • https://raligeledow.weebly.com/uploads/1/3/4/8/134893256/740d3b218e.pdfIn PDF document text
    • https://wefexubi.weebly.com/uploads/1/3/2/7/132712326/bodal.pdfIn PDF document text
    • https://cdn.sqhk.co/tidapavibu/eiflzaN/aasld_hepatitis_b_treatment_guidelines_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/xGgh8he/first_photograph_of_electric_chair_execution.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/jdgeYWd/degerokexifanefataviduzun.pdfIn PDF document text
    • https://banafovogakake.weebly.com/uploads/1/3/5/3/135326552/lesesomerawepewig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393181/normal_5ff50d7b30127.pdfIn PDF document text
    • https://pusugokejetajek.weebly.com/uploads/1/3/4/7/134765622/474477.pdfIn PDF document text
    • https://cdn.sqhk.co/juzureniwibu/1Dfhcja/mario_kart_7_online_races.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/albino_hedgehog_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/date_sheet_2019_kuk.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/orbit_er_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/wojoveranuvurimoziwa.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/jakotitosebemuwat.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/sodemiloxodotamakiwub.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/difevu.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/contoh_karya_ilmiah_tentang_bahaya_merokok.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 5156 bytes
SHA-256: 3c0067e0df83c63e5e62aea64928af205a9fb86415b37a859cf563ddbb09faf8
font_02_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 2268 bytes
SHA-256: d0678baf26bf595a56535f9fc1a9c87468f343cc7d9e29e63b139705ffa46bf4
font_03_sfnt_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 11388 bytes
SHA-256: 2f79dc3bc10f53803b9ae4252dbe46cd661b23e3d799684d0412fc915a640538
font_04_sfnt_off00012d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D57 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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