Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ec95a4d46830e5…

MALICIOUS

PDF

78.1 KB Created: 2021-05-11 21:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e2f56b691375a3f92046efe10304a6a3 SHA-1: c61958e8cc2ca4f263f5fec63e59e2e150dd4ec0 SHA-256: 56ec95a4d46830e595115e0ab73d455c8f28a95a52634058209fdcbe72fadaa6
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 0.9997

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://vilenefex.ru/strik?utm_term=ga-ma785gm-us2h+audio+driver PDF link annotation
    • https://cdn.sqhk.co/tevimuwijile/TFgh8gh/19067943183.pdfIn PDF document text
    • http://requiredjokblog.com/nvs_6th_class_admission_formfqxb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393489/normal_5ffd294d295ef.pdfIn PDF document text
    • https://cdn.sqhk.co/jagugide/jiBo7Du/yellow_finch_sounds.pdfIn PDF document text
    • https://gerezedudamun.weebly.com/uploads/1/3/4/5/134507019/zigik.pdfIn PDF document text
    • https://ninijaliwejito.weebly.com/uploads/1/3/4/3/134350726/2334041.pdfIn PDF document text
    • http://devicesprotectionforusers.site/nokokonukekrm2c.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/Hgcgcu6/bubble_shooter_extreme_level_225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_60537ac4697c2.pdfIn PDF document text
    • http://sait-ok.ru/can_you_forward_your_mail_internationallycfiza.pdfIn PDF document text
    • http://bioforce-co.site/bitstream_font_manager_freeon8pl.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/Kpwieih/17228481099.pdfIn PDF document text
    • http://bigpleasure.ru/highest_common_factor_worksheet_hardd0dwj.pdfIn PDF document text
    • https://bexubefobex.weebly.com/uploads/1/3/4/4/134476762/feninurev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_605d73fab6c78.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/dCieieH/classic_bubble_shooter.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/icWSpie/dakikeposekusa.pdfIn PDF document text
    • http://xejevojesinil.22web.org/simijiduf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kivutivepew.rf.gd/folakusepadinakilo.pdfIn PDF document text
    • http://mududexabaxame.epizy.com/28780832681.pdfIn PDF document text
    • http://vufeligix.rf.gd/xajafuniruneburababi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 4704 bytes
SHA-256: 46cd624262a7cf479b755a9803cc0d53c0572e3ed2199ad0ce7fc7fa1df2d211
font_01_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 5860 bytes
SHA-256: 34a916602a7bd1cd3c941a9a99a011ac5ce9a8d669a47b67f915c079ef7add0a
font_02_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 11000 bytes
SHA-256: 654fb8d72d2c98a752498461d49d20b5b3befc7a0806120e6b3ceb20d1f1ea14

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