Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a7493034304fb5…

MALICIOUS

PDF

79.5 KB Created: 2021-03-15 22:04:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 583675b8a2d76a1bcb7de3e855ed828b SHA-1: b1d522f65fb112d2b9ab43f0f72e9c8c33995bad SHA-256: 25a7493034304fb52a465dee67f789b0fdcf1df8c2806dfa463ec83ac2fbf6c6
186 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous external links, with one pointing to 'https://kuzutuzo.ru/wix?keyword=lenovo+laptop+service+manual', suggesting a link farm or phishing lure. The ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' further indicates a phishing or trojanized PDF. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest a malicious intent, likely related to phishing or malware distribution.

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://kuzutuzo.ru/wix?keyword=lenovo+laptop+service+manual PDF link annotation
    • https://cdn.sqhk.co/pogadidotilu/gfhaUig/69484543862.pdfIn PDF document text
    • http://milansit.space/a_series_of_unfortunate_events_the_wide_window_quotesjq6o8.pdfIn PDF document text
    • http://instapriz.online/visio_football_playbook_stencile1u7e.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/iijijvI/wejunaxanum.pdfIn PDF document text
    • http://axecheat1.xyz/fedarifopirosejnquba.pdfIn PDF document text
    • http://erogan-oficial.site/day_trading_for_beginners_bookftj4d.pdfIn PDF document text
    • http://dixunawizodel.iblogger.org/collecting_ant_specimens_reading_passage_answers.pdfIn PDF document text
    • http://ufenmac.com/13461725620vc6ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_cd8bb1d0ac5e442ea76d6663d52c9142.pdf?index=trueIn PDF document text
    • http://misibinebob.epizy.com/putting_drills_at_home_on_carpet.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_dd977a38d0c24c25baffa80091b2d89a.pdf?index=trueIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_a2007d07e71f47afbc249d4d1566309c.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_1bc65a2067884a279153ee67b2cb01b4.pdf?index=trueIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_079e347982fe4a1583769707d2f76f49.pdf?index=trueIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_7806dc436a194a389ec14ff8ec5712e6.pdf?index=trueIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_8649e57d3a8e4b13ad54fed68fe95c1e.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_417899bad77b46a4b5d605e44edee8c2.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_dc374c047b334661a3168d08566155c5.pdf?index=trueIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_a977c355324b474ca076234efd665349.pdf?index=trueIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_866840c085e642a6a12be7f50e5e6b67.pdf?index=trueIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_44a63be6e6cf4dfdaa0264d4a6965320.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_63f64125f04e4acf8ed66b00ca0353ec.pdf?index=trueIn 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_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 5080 bytes
SHA-256: a3b0eda043c77857aac4b62c66cc6aaf45fa4466685ee28bb0ffc162f8916da5
font_01_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 10672 bytes
SHA-256: 98f8cb0880a6836aa60e221911a44609efac073db3214041e14b5ad877c0eb93

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