Malicious PDF — malware analysis report

Static analysis result for SHA-256 80eb1bdbde79f1bf…

MALICIOUS

PDF

71.5 KB Created: 2021-03-21 22:38:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0c5f9729a3d14d72038347fde422483d SHA-1: 997131bcd21cf0a620383209fbaee40073b98dde SHA-256: 80eb1bdbde79f1bf3d0191445be886f6ea2f14a713cb0a960a13dc972b488f96
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and is flagged as malicious by ML classifiers and ClamAV. The embedded URL `https://bologen.ru/wix?keyword=active+physics+textbook+answers+chapter+2` suggests a lure related to textbook answers, likely to trick users into visiting a malicious site. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://bologen.ru/wix?keyword=active+physics+textbook+answers+chapter+2 PDF link annotation
    • http://helpverifybadges.com/jurolumidepabazenav6ove.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403531/normal_6004de09a8aff.pdfIn PDF document text
    • http://magnetfix.store/labyrinth_definition_thesaurusoqef9.pdfIn PDF document text
    • http://goldstein.berlin/minn_kota_power_drive_45_ipilotx6hq3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454438/normal_602d79031812b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409110/normal_6019528f534d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456116/normal_5fde631d5063f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445743/normal_6025eaa1d9e89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367937/normal_6004588a033ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sesijesule/19816003802.pdfIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_8f48016d89174e92b877414478d5112d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/1607291367.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_e02623b8533c48899f2013ea57353fed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevowimo/book_review_format_ks3.pdfIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_09c4419d41c14af1aba4063549959d97.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_0e8f97f9952b46bfb05108038b15e32d.pdf?index=trueIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_89c3ba72f5594307a3287680113dcfb1.pdf?index=trueIn PDF document text
    • https://60883313-e483-4213-bdf2-3844198a3b35.filesusr.com/ugd/3ba96b_0465bccdd72749a4b267de334e2d756b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/madababegizo.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_9221f2aad31943d1a799c15fce9dface.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/1926616750.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_96bee3fe8b0d49c7a5b157a368899ef3.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 5424 bytes
SHA-256: b974a0139bf050790d324f708c3142ff4d545a100e48f037cf5c540865f179f7
font_01_sfnt_off0000ddc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC9 10584 bytes
SHA-256: 830afcd5ca96ed95a92125525530839eb6b06bf940d9d88883b3e53c40d7b6fa
font_02_sfnt_off00010201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3