Malicious PDF — malware analysis report

Static analysis result for SHA-256 857ffd4e8cedded3…

MALICIOUS

PDF

83.2 KB Created: 2021-04-16 20:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e9eae81b9c6f22ad5673edb5523839ce SHA-1: 7337da21eb44660d8a7c094a54bbc4febfa2f785 SHA-256: 857ffd4e8cedded3ddb8fe50f89bfe6980ca2f3398dbb0ebe5fbe468f254f8fb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9993

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://ponafet.ru/strik?utm_term=how+to+change+an+image+into+pdf+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384822/normal_602468ae6c9e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_60677b75a3462.pdfIn PDF document text
    • http://girlita.space/luremurogexutelaliv57rk.pdfIn PDF document text
    • https://cdn.sqhk.co/dagizonu/b5highl/34833624381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414680/normal_6042895aab204.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/9873629802.pdfIn PDF document text
    • https://sanijala.weebly.com/uploads/1/3/4/8/134889677/f1e983b43.pdfIn PDF document text
    • http://akfb.online/283818777752v0wr.pdfIn PDF document text
    • http://icily.xyz/sch_binh_php_tn_t_trong_kinh_doanhxm7sm.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/the_exorcist_remake_2020.pdfIn PDF document text
    • https://rajotabew.weebly.com/uploads/1/3/4/3/134360909/69ccea6e2266cb5.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/e920c64fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470689/normal_5fe7c6ffc1c09.pdfIn PDF document text
    • http://vir-tus.com/fruits_mania_fairy_rescue14o89.pdfIn PDF document text
    • https://cdn.sqhk.co/jejekije/jbjdghJ/lusima.pdfIn PDF document text
    • https://somokowu.weebly.com/uploads/1/3/1/3/131383604/86712.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/1hbJjbn/80th_birthday_decoration_ideas_for_mom.pdfIn PDF document text
    • https://cdn.sqhk.co/nafumozuwe/hhieShc/mulopesomijog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_6009f6d172d40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejufutaz.onlinewebshop.net/wusurirorukupub.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/grade_5_worksheets_science.pdfIn PDF document text
    • http://lelikerakovet.atwebpages.com/antonin_artaud_poesie.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/78677750979.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/65631128598.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/what_are_the_similarities_between_house_of_representatives_and_senate.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001088f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 5412 bytes
SHA-256: 9c13d51d4d08de6a5a5d437890eaf34a2c1a183030f318de0b1c1d6bea9b1b2f
font_01_sfnt_off00011ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 10844 bytes
SHA-256: 6ebedaa1f67246fc0f4e7e564cfe663345e4b9fbe15dc0b0832bb7317e25d30b

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