Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e8f637b3dc3bc1…

MALICIOUS

PDF

95.1 KB Created: 2021-03-04 18:59:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d66a891550a4f69b0eed892127002bea SHA-1: 70c37abcd320cc6fd60cce5cbaf07da6077e68c7 SHA-256: 70e8f637b3dc3bc1ece2569518e83a9e14f428e4920a03596fb32b2629e18276
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or distributing further malware. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=moca+basic+spanish+instructions PDF link annotation
    • http://tuderoba.getenjoyment.net/fy18_cpo_board_eligible.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/91e5a2ed1b8a433.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/toshiba_vcr_dvd_recorder_remote.pdfIn PDF document text
    • https://soliduratop.weebly.com/uploads/1/3/2/3/132303261/kujusav_zetomowosolu_sozikobekuxuwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://luremugaxufarup.epizy.com/34862598901.pdfIn PDF document text
    • http://raxajabidadida.onlinewebshop.net/how_to_use_casio_graphing_calculator_fx-9860gii.pdfIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_45883498d10c4519b70f3ab8675f324b.pdf?index=trueIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_2703e26d7baa4fdab16932f76b10cac5.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_139817edceb8457686fcca7a694fb5e9.pdf?index=trueIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_ccd90fa593124ffbae1d75a900971093.pdf?index=trueIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_6b3d02f8ddc6488f92be664550000756.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/dubidamuzibapi.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/auxiliary_verb_word_champion_answers.pdfIn PDF document text
    • http://zatozegajuzu.epizy.com/vepofetitiguzutififogimir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12896 4896 bytes
SHA-256: 53e131b5fa463300a58e3e8baf172b21a0a5a226ecacc3ab84724c62439c9ff0
font_01_sfnt_off0001391c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391C 12780 bytes
SHA-256: d11e4148421131e0384a0bff9b5370537e0a5873f03a13dd7c5994c941ad1fe1
font_02_sfnt_off0001619c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1619C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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