Malicious PDF — malware analysis report

Static analysis result for SHA-256 33be776f16e8edb1…

MALICIOUS

PDF

74.5 KB Created: 2021-06-07 12:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4d6021c12bd31774e8192646cff8a40d SHA-1: fd1b3b0e8e1205561c246fc19f7c174ee294bbeb SHA-256: 33be776f16e8edb126eba2d7081cc4efbbb6c92e72690519b1f7b683f5eb109b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://catamma.ru/pbw?utm_term=how+to+pass+the+test+in+gotranscript PDF link annotation
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/e5bdbd38cf.pdfIn PDF document text
    • https://kerumesuni.weebly.com/uploads/1/3/4/1/134131613/bijajujufaxeminen.pdfIn PDF document text
    • https://nizikalod.weebly.com/uploads/1/3/4/6/134605229/3403b629c.pdfIn PDF document text
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/2551081.pdfIn PDF document text
    • https://fofebufog.weebly.com/uploads/1/3/4/7/134738758/tezakejinimivaju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388174/normal_604aa34c6b3bd.pdfIn PDF document text
    • https://jopuwijexanubuf.weebly.com/uploads/1/3/0/8/130874501/rinubegujazug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_606b4e9854030.pdfIn PDF document text
    • https://kumojazoj.weebly.com/uploads/1/3/1/3/131381946/terexuxiju_jisopub_bivomexezo_gezowesevuvubad.pdfIn PDF document text
    • https://kutekedutowake.weebly.com/uploads/1/3/4/6/134635623/giduxe_dasovezufuvaso_vajuterumabo_zasekaloda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2361e27-7713-44a7-ab4b-3c40efc5ffaa/zufopenizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce541479-623f-420c-81c2-ac425e4e9d36/feziwuzukanenubusokim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/033a5e82-b3b8-491b-826a-cc2ee84fcc70/kemixemuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f515cafb-570f-40d3-9cef-5100d893afbc/easy_keto_diet_plan_uk_free.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/w/file/fetch/144589200/how_to_embed_a_file_within_a_word_document.pdfIn PDF document text
    • http://venatulafiz.pbworks.com/w/file/fetch/144425616/zejixifikixikofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/503fa293-863c-410a-8ce6-5af7b7882bbd/nesiriw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d2def53-6d6b-4ed5-8c83-fc991a387ca3/17346924494.pdfIn PDF document text
    • http://mukonisu.pbworks.com/w/file/fetch/144458583/verinekorubepijunate.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144423102/fox_hills_stores.pdfIn PDF document text
    • http://votekotokuz.pbworks.com/w/file/fetch/144653460/simple_origami_christmas_tree_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/444ada77-638e-47c8-b67c-d8ada091feb3/barcelona_vs_real_madrid_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce6ac754-53f9-48e0-884b-d6e71b3f3c0b/consejo_estatal_de_participacion_social_hidalgo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb72486d-2bf1-4f12-acb0-b97f2c1735da/fogozalut.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_off0000e54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 5216 bytes
SHA-256: 38fd1be10ca8681bf9fb096548e60787b0b09009be7339c015ec6c08ee4e24dd
font_01_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 11004 bytes
SHA-256: 0d026b3e0b855df49dc5723c3deedf317992d0f5c1a9e07f98170acd67e1fa81