Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7640e32f4e88514…

MALICIOUS

PDF

96.9 KB Created: 2021-04-25 00:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb2a43dd284bbcb4cbb1b4db674c19a4 SHA-1: d326c712db7a75588b2bdea03b0ffdc6dc401444 SHA-256: d7640e32f4e885146f059c153d713701438d56a228ff47eb10df71763c771133
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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 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://dafemum.ru/strik?utm_term=what+is+the+next+book+series+after+percy+jackson
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/sijolezuduwemibajo.pdf
    • http://batut.space/11688805527wccu5.pdf
    • http://instofficial.online/equations_involving_fractions_worksheets3ami3.pdf
    • https://wozomeki.weebly.com/uploads/1/3/0/7/130776066/7523724.pdf
    • https://puwirobazavuwo.weebly.com/uploads/1/3/1/4/131453501/gitomofi.pdf
    • https://xisiwifuroki.weebly.com/uploads/1/3/5/3/135323104/8150228.pdf
    • https://kisotupojez.weebly.com/uploads/1/3/4/4/134493444/buraruk.pdf
    • http://shopwithsale.website/22430512091s8ye8.pdf
    • http://flylovel.com/resiwiwegalukumexakobefev4dvxi.pdf
    • http://csxmoney.info/hp_probook_6470b_charger_pricezd5oq.pdf
    • https://daxajofu.weebly.com/uploads/1/3/0/7/130740026/niralizapez_jodaj_pesinekotarajo_zumabugabibizi.pdf
    • https://pumelagu.weebly.com/uploads/1/3/2/8/132814433/47403d8.pdf
    • https://muxolebutelun.weebly.com/uploads/1/3/2/7/132741382/solobefukofoni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_44611af9cbb5482692fba1ce46296911.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ad30d717-10d4-4c79-8827-29eb023e0a71/xupametako.pdf
    • https://uploads.strikinglycdn.com/files/3ba9f40a-d5dc-4847-b090-3015f0ff86d7/43116174094.pdf
    • https://s3.amazonaws.com/telasebisu/arewa_angel_by_ali_jita.pdf
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_ae9849b2d3784f8ab3669706c5147291.pdf?index=true
    • https://s3.amazonaws.com/bagokiko/89558129307.pdf
    • https://s3.amazonaws.com/wutogugej/netinebexofesawo.pdf
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_1d54f6127a4b459982d8636e1814bbfa.pdf?index=true
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_28182bb0b94d4ef38f30d8cde05aa01b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/58e0de27-6340-4fdf-bb06-c32ca3f197d9/grade_11_physics_electricity_and_magnetism_notes.pdf
    • https://s3.amazonaws.com/divexikav/41588564903.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c25.bin
9b88a965263764e8ac4399522fb4d365bb8b3917d1db43c9612026bec154e4c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C25 5536 bytes
font_01_sfnt_off00014f0d.bin
65dbb291bdb2dbef4ff4fb537d2cb148ac79900399500f868bcc21dafd02009b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0D 11764 bytes

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