Malicious PDF — malware analysis report

Static analysis result for SHA-256 66dc029163cf0e91…

MALICIOUS

PDF

80.0 KB Created: 2021-03-21 05:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 567c9714ed8966aadaa08c4db10f7af2 SHA-1: 558e205906c463491d85aadf1e042d4fd0f61d3d SHA-256: 66dc029163cf0e91f0cb4a4cc8249f6151aff895617d664ce73b9f906af42e6b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://vilenefex.ru/wix?keyword=greenlee+am-6+analog+multimeter+manual PDF link annotation
    • https://dakopubelodeb.weebly.com/uploads/1/3/0/7/130775015/c44a356bf5db2.pdfIn PDF document text
    • https://larigagip.weebly.com/uploads/1/3/4/8/134887586/jirupuzixagu.pdfIn PDF document text
    • https://cdn.sqhk.co/rowalulo/6jikjjn/20414229386.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/Vgjjiic/86025014551.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/LyjcjhF/77828839441.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/tieNdja/100_games_to_play_at_home.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/aDhdvJp/head_boxing_d_d_dream_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/OiiihKE/lego_chess_set_walmart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_6047729f291d7.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/fXzv8ts/soccer_random_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/a31GZj6/square_adventure_geometry_dash.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/giXJggr/infinity_train_simon_death.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460055/normal_6041a19032bce.pdfIn PDF document text
    • https://viwijivawapel.weebly.com/uploads/1/3/4/4/134492302/wetalem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_0c7e6045ac004298a2f5a0975ed6b61a.pdf?index=trueIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_f87578b3e638437797c6eb64a420e8a6.pdf?index=trueIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_276241cb69014a548e504120acd0fa90.pdf?index=trueIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_6c832654b74d43f292eb15bd744d7cff.pdf?index=trueIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_d8437eaf888443bf8a7863767c7182a5.pdf?index=trueIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_a7e996a30a2d4fb2843b6f2025a0195b.pdf?index=trueIn PDF document text
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_f2bc78f5edf5411197393b93ebfe3f2d.pdf?index=trueIn PDF document text
    • https://c3e780e1-a1ee-422e-80b3-2bf79490ff1e.filesusr.com/ugd/dc7b26_946d1ee77b3a4d0ab249866cdf10de31.pdf?index=trueIn PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_150d916f731f44aeb5f9b021d4e088d1.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_6049c3057a674bb99b6c30b6c5b035f2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 5044 bytes
SHA-256: 24854b7d7a4072823e82022fd5f20f1e8e37907cf8c3264e458c12e04fd9833e
font_01_sfnt_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 10992 bytes
SHA-256: 3dd9b2b26aff56407399a0d9d1614312305cee3075b4e39473ae734d847fc0dd

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