Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0fc3de92865c5a…

MALICIOUS

PDF

90.1 KB Created: 2021-04-06 12:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 84147453b8b9d2b6667d246cdaa62ea1 SHA-1: 5923050dac384a2126d310af655a3410422fa16f SHA-256: 9c0fc3de92865c5adde0e0e295e773b4dab94def6c28282ae270d48926b6b1a8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://baarspo.ru/wix?keyword=6+energy+and+chemical+reactions+worksheet PDF link annotation
    • https://cdn.sqhk.co/wujodazera/iemhdDe/cbse_class_11_maths_syllabus.pdfIn PDF document text
    • https://bivibonade.weebly.com/uploads/1/3/4/0/134041173/6ea85cd2d0c818.pdfIn PDF document text
    • http://tonilakifak.mypressonline.com/ditiwemetiwudafugisijidej.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/haOm7jc/black_guided_meditation_podcast.pdfIn PDF document text
    • https://cdn.sqhk.co/neviragar/ijajaPF/44054814820.pdfIn PDF document text
    • https://gobazivow.weebly.com/uploads/1/3/1/0/131070387/diroxojuf-firofasemig-lipaz-gepavuvulodizum.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/LgchbIe/lududuti.pdfIn PDF document text
    • http://tunewejewuz.mypressonline.com/proof_by_contraposition_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/fafovewidom/RjiLjg0/steam_vr_games_for_oculus_quest.pdfIn PDF document text
    • https://cdn.sqhk.co/rigidaluta/cVichgh/32538612531.pdfIn PDF document text
    • https://sivipafegedijog.weebly.com/uploads/1/3/4/4/134443607/4952530.pdfIn PDF document text
    • https://jewefero.weebly.com/uploads/1/3/1/3/131383264/a8fcd05ff4d3ef5.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/gasodamuza/star_trek_discovery_season_2_dvd_release_date_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/43690870200.pdfIn PDF document text
    • http://tofilijewok.atwebpages.com/gujarati_to_english_barakhadi_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/business_plan_marketing_strategy_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/clown_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/13160674990.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/dozininul.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
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 5672 bytes
SHA-256: 9fe0bbdd1c7d9413b91887e4334f28549021e2fad1f1e768b35a9b3a7b320bb4
font_01_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 11436 bytes
SHA-256: 5fca1ee6b4836634b5425b14c343e9a3f26fa1bfaa872149487aab1f473f4e4c
font_02_sfnt_off000144a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A2 16260 bytes
SHA-256: b1b93bf558ee65cf174bdde98fc70b39c77ddcfeef9d3a00758a58eb2f24951c

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