Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d77f03284e3d23…

MALICIOUS

PDF

83.3 KB Created: 2021-03-26 06:20:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 078feac93ae6e0eb79cd5f403ec682e9 SHA-1: f87b46f2b7b662c7c7b088f2d0905743413b4d85 SHA-256: 70d77f03284e3d23c8cf479ecca2b1fe32c9cb55a4f36b5e4b21ae197f2c8575
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/award?keyword=arithmetic+progression+notes+pdf PDF link annotation
    • https://cdn.sqhk.co/baxorurifina/ichhODA/bike_racing_3d_hack_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427104/normal_5ff8edde2900a.pdfIn PDF document text
    • http://pornbustyvids.com/zasimadosavuzaln643j.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/biihcge/spider_solitaire_2_suits_full_screen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424682/normal_603e3e963c492.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371814/normal_5ff29293b1721.pdfIn PDF document text
    • https://cdn.sqhk.co/vomikigiw/QCYZgec/football_2020_standings.pdfIn PDF document text
    • https://cdn.sqhk.co/xusikeko/iMmSchj/automa_tag_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_602422767e9fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460708/normal_6055be1135f0a.pdfIn PDF document text
    • https://cdn.sqhk.co/jodariwem/ZFOifD3/zududarolilumora.pdfIn PDF document text
    • https://cdn.sqhk.co/gujadozede/hgNheaj/css_dark_knight.pdfIn PDF document text
    • https://cdn.sqhk.co/pajijolabalu/aKMlQgh/jepejefaketoxalemobexoku.pdfIn PDF document text
    • http://hayatevesigar.online/12911702374a0ykj.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/g1fBJEE/58306670531.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/caiaeii/10744634372.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413865/normal_60095bd85fa7d.pdfIn PDF document text
    • http://esagafow.fun/wikokoboro1ck5w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406481/normal_6026607d24a97.pdfIn PDF document text
    • https://cdn.sqhk.co/zebapomiz/1DjjUJA/age_of_war_2_similar_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_1c9bf3eeb4734f94a403b9b964d1f53a.pdf?index=trueIn PDF document text
    • https://bb0106b8-f3e0-414b-a873-a0e24df3f2ad.filesusr.com/ugd/b84a33_43cf788343a748f59a0101f0709d1d2b.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_ecbe70885593488fbb2bcb2c1761de4c.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_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 5316 bytes
SHA-256: 9c59684f9ba8a9844e3eef0e74e85e7ff40aa2cb8357fd996824d95eafbc66c5
font_01_sfnt_off0001016d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 11884 bytes
SHA-256: f1d3ebeaa9ceabbb59ad8b558dcd95d4a974b3b56a2edc090112665515db82e0
font_02_sfnt_off00012a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3B 16112 bytes
SHA-256: 14ba37ba286471cdff1772641fcb01bfd06f8bdee169064dae76f7af43a1035e