Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bccf262d58db2f…

MALICIOUS

PDF

80.5 KB Created: 2021-04-04 20:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0a4bb6040076fbf6f1ed05e552da9b3b SHA-1: dcc611ef31a03199d8ef54bc5a1818cb56cdc7ea SHA-256: 65bccf262d58db2f5393699d53ff8407971d26f89fba973f876daf8ba88510a8
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document exhibits characteristics of a phishing lure, indicated by heuristics related to SEO link farms and urgency. The presence of a 'Browser extension / update installation lure' heuristic strongly suggests a social engineering attempt to trick the user into downloading and installing malicious software. The document also contains numerous external URLs, with one pointing to 'https://maypoin.ru/award?keyword=bank+of+america+pdf', which is likely part of the phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://maypoin.ru/award?keyword=bank+of+america+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380229/normal_603041d18fbfd.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/how_to_repair_bose_wave_music_system.pdfIn PDF document text
    • https://turarizamagux.weebly.com/uploads/1/3/1/4/131453837/3688800.pdfIn PDF document text
    • https://moxitason.weebly.com/uploads/1/3/4/3/134384587/8680451.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/gghxPE3/guess_the_tiktokers_age_quiz.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/tagegukonukaner.pdfIn PDF document text
    • https://vopemafewiza.weebly.com/uploads/1/3/1/4/131408930/wisuzubo-xebipisililo-bitutanix-tixato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_6011c3922cf23.pdfIn PDF document text
    • https://nalovitifa.weebly.com/uploads/1/3/4/6/134600698/dokinalesamifasiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412591/normal_60081c47300e1.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/56dee1350cf8.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/ggYhejj/enemy_strike_3.pdfIn PDF document text
    • https://jebezefekoju.weebly.com/uploads/1/3/4/7/134737834/8952958.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/66578355380.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/nokabuwanisepil.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/55597888744.pdfIn PDF document text
    • http://nivuzujanux.myartsonline.com/fefofimogimupolilizoxapu.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/nizawalawixuwosum.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/binifibegutulit.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 5204 bytes
SHA-256: 3e83f191faa08f89cd210461f6da23630a2661e4623017940669ca13685fc3bf
font_01_sfnt_off00010f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1B 11168 bytes
SHA-256: e6e6f37c21890c174c2c3480dd6b9c0f167c3d56e8368558bba083437f7431e1