Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6684cd3c98d732…

MALICIOUS

PDF

80.9 KB Created: 2021-06-02 03:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dd27c3a97b8d2cc9080cba7db0d3329c SHA-1: bddc7ea2f5f12f7260dc450ce08db443d1c48a1e SHA-256: 0b6684cd3c98d732208f224abf847245538a8be4e7fd18fa93e0be06ceae5fec
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 pointing to disposable hosting, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drafthe.ru/pbw?utm_term=how+to+tame+a+wild+tongue+rhetorical+analysis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4493579/normal_5ffeb250d92d6.pdfIn PDF document text
    • https://puzapageduz.weebly.com/uploads/1/3/1/4/131453954/ee31a3f934bf554.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374976/normal_5fc90dbb1bc9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501046/normal_603b752e689b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447884/normal_5ff0948eb5c91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420454/normal_600243b86afea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_60238842c0669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530712/normal_601bff616ce45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_605bf87f58c5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391008/normal_5fe02051e1245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463791/normal_601794d41dda0.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://kunixove.pbworks.com/f/atoms_elements_and_molecules_task_cards_answer_key.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/f/what_are_the_4_major_marine_biomes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf2436ae-5646-4a56-a0f9-f75719a119f1/komitisifinetedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5e0c166-704a-4a25-b431-21df5e554451/60580840849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f58e470b-07c3-4cb5-9954-c4a62e22a835/when_you_know_youre_wrong_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecee7100-f510-406e-855b-96a9a115ccf8/59008932703.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/f/91996055106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f53a37-eb79-4413-bccd-e1cc8d80bb51/how_to_diagnose_car_ac_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/021af462-96c7-4fd8-99cc-268c6460d992/is_the_call_me_by_your_name_book_appropriate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa0699c-dca3-43e1-beb3-db7c0301a22b/70543836037.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144449457/73186454283.pdfIn PDF document text
    • http://kunixove.pbworks.com/w/file/fetch/144483483/subject_and_object_pronouns_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89fbb16a-51c2-4e18-9f7a-f12f1c473a38/detox_diet_recipes_for_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ee011f9-fdbb-4108-a6de-22a4340dada2/kobelotixujud.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_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 5392 bytes
SHA-256: 3852a5144d7e17594ebe96ccb529a5d2124e928936deee90a2203545c2adf1c1
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 10872 bytes
SHA-256: 0a2b17c5e29d593090d4d54d826c479c2aabec06105190d45f9859507b3c9b79
font_02_sfnt_off000125f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F8 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71