Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16cbab62cfa91f8…

MALICIOUS

PDF

86.7 KB Created: 2021-03-30 00:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5c7cd37d8f7ef882414aa3715dcfb757 SHA-1: 229d5685c4b64bf8a3ac13e14e3b2795cdfa67f7 SHA-256: d16cbab62cfa91f887e13df1f9d5258e39b2f30c3db38363269d51730645975f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is vilenefex.ru, which is likely used to host or redirect to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/award?keyword=toxins+and+antidotes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467955/normal_60251a8ca66d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470231/normal_5ffc01866f732.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465264/normal_5fe3ffadeb3af.pdfIn PDF document text
    • http://nosixavol.sportsontheweb.net/pomanajazuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_600b38639e044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_602f4c5507058.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471703/normal_5ff00739e3981.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_c5cf090550e145579315be5e028c7f50.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_85e3e9cd0e4542db90c42c3950635678.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_6b072a269cc64475b4796c5a3cac317f.pdf?index=trueIn PDF document text
    • https://182222a4-a7a4-434f-839c-7103b506edb5.filesusr.com/ugd/224a67_1acd8780c3ca4eceb55c062b055e8415.pdf?index=trueIn PDF document text
    • http://bemegozipebim.epizy.com/aviation_weather_study_guide.pdfIn PDF document text
    • http://kukatunudivolu.epizy.com/google_drive_limit_reached.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/47534369257.pdfIn PDF document text
    • http://jelomasulavi.atwebpages.com/the_road_not_taken_analysis_line_by_line.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/63085725645.pdfIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_bd4cb0d295f54688be9914c3ef6c65a6.pdf?index=trueIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_6c1d1de37a82402f8b0ec89302da4ceb.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_a0a0c62807ec45fa895a047a3649cb23.pdf?index=trueIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_afd66f546ab84e03b0da9d519c3da90c.pdf?index=trueIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_8a1e250cb7a141d593369eb1fe21b8df.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 4924 bytes
SHA-256: f2b4e45330ed403401f4c3312b6d5e92532cd62015966afd499ca516693c29da
font_01_sfnt_off00010fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB7 11424 bytes
SHA-256: 5ad533ddcf708f24a69dddf56a4b5deda5d6d5614f459d5c8f2114cde696e087
font_02_sfnt_off000136e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E1 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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