Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a6af80cc621c9e…

MALICIOUS

PDF

66.2 KB Created: 2021-02-26 16:59:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 053cb3ea1d19f4222f9c5272ece09519 SHA-1: 5d7be39a895d7169d9233f141921adf287d3fc95 SHA-256: 33a6af80cc621c9e243b855bd31fbb7aa945c99e4c6d1b24caf101813b6d88ab
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF document contains heuristics indicating it is a credential phishing lure, specifically impersonating Chase bank. It also functions as a link farm, hosting numerous external links to other PDFs on disposable domains, suggesting a multi-stage attack or content distribution network. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://bobuwazubugomu.weebly.com/uploads/1/3/4/4/134494734/risibazuz_pebowa.pdf.
  • 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://botokaw.ru/wix?keyword=answer+key+to+kill+a+mockingbird PDF link annotation
    • http://junelizirigoroj.iblogger.org/alpine_cda_9884_bluetooth_adapter.pdfIn PDF document text
    • https://bobuwazubugomu.weebly.com/uploads/1/3/4/4/134494734/risibazuz_pebowa.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/8845fd20fd96c1b.pdfIn PDF document text
    • https://zatibuvox.weebly.com/uploads/1/3/0/7/130738619/texumoxoxujuxiruvabu.pdfIn PDF document text
    • http://dilijox.22web.org/whatsapp_caducado_android.pdfIn PDF document text
    • https://mitumusifunezu.weebly.com/uploads/1/3/5/3/135316179/571309010972.pdfIn PDF document text
    • https://kovunigok.weebly.com/uploads/1/3/5/3/135317038/serefu_bofogaretolo_nidegakawaf.pdfIn PDF document text
    • http://sodahq.pro/54265669503oabkh.pdfIn PDF document text
    • http://smeh-mif.space/how_to_download_a_later_version_of_minecraft_1.12.0y854k.pdfIn PDF document text
    • https://wanevowak.weebly.com/uploads/1/3/4/4/134465130/6342ea9e4.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/4ecf24.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/fujadabez/kimoridurafim.pdfIn PDF document text
    • http://lugaderova.epizy.com/judgement_ps4_friends_guide.pdfIn PDF document text
    • http://wipidomi.rf.gd/minecraft_1._14_free_mega.pdfIn PDF document text
    • http://kugofabafomozo.epizy.com/ahqaq_ul_haq.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/xurimovuxis.pdfIn PDF document text
    • http://gebutetivifupa.epizy.com/20352182984.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/how_is_your_family_answer_in_english.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_off0000c6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D9 5648 bytes
SHA-256: ed2e642a9aa783bacc733febf702c1c5279a310f5fbe0a24d4f7b740b56dc308
font_01_sfnt_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 9928 bytes
SHA-256: e56020cd7404bba4010cb9cdc79701e49f4d6dc85bffad1b4fd90df1ad6d45a9

Open this report in the interactive analyzer, or submit your own file for analysis.