Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdab2d7ce217a40b…

MALICIOUS

PDF

74.1 KB Created: 2021-06-07 06:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c2682d12469c1e97c57dc4f7a23c9667 SHA-1: 579a19a08b6864ca64f9b008a4f3af75b5bcd050 SHA-256: bdab2d7ce217a40bb7d4483288905334d64bf0ca4c2c0e832a37a6ead5188e6f
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly indicate this pattern. Although no scripts were directly extracted, the nature of the link farm and the ML detection suggest it's designed 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://medvor.ru/pbw?utm_term=mudra+loan+application+form+pdf+bob PDF link annotation
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/niziz-tazimizovid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403273/normal_602075396e91d.pdfIn PDF document text
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/kirojitenozebu_rafinexunerid_pexikudodazol_tipigixekoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_6035a52a7695d.pdfIn PDF document text
    • https://rusopuse.weebly.com/uploads/1/3/4/4/134498446/7750285.pdfIn PDF document text
    • https://venofizemebesok.weebly.com/uploads/1/3/2/6/132681219/6d7ff0751eec6.pdfIn PDF document text
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/libutatigipulaximi.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/93ccec17-111b-4995-8595-deaabd9c3f4e/how_to_become_a_restaurant_server.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd67b1b9-4771-46f5-98c4-55cb55b63a7e/kijodamumudaxisozuwuvizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b44cf4-0370-4aa4-88ba-078869be5386/how_do_you_feel_when_your_iron_is_low_during_pregnancy.pdfIn PDF document text
    • http://bowawesup.pbworks.com/f/2d_shapes_worksheets_for_year_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4db2e4ea-4664-46ea-9028-b65daded4c2d/yogi_ramacharaka_science_of_breath.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/f/download_angry_birds_star_wars_2_mod_apk_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60892964-8a27-4458-8420-5a7c73a65c94/88951771412.pdfIn PDF document text
    • http://barotidi.pbworks.com/w/file/fetch/144626172/ielts_academic_writing_task_1_samples_rachel_mitchell.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144447984/71235216484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6beedcec-3881-4414-844f-dafad8a76158/5389849881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e715845-cb80-4300-b218-91fb39633fab/85287420104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/104384da-0859-4a31-8206-5bb01cd07b7e/83987646691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec14e6d1-9532-46d9-81f0-8d6185b8a430/navy_n_code_list.pdfIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144463917/dexamethasone_suppression_test_interpretation.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_off0000e66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66F 5268 bytes
SHA-256: 326c4faabe670fcedf25c3480a718f19f4c3694941d75223487bd644be5c3c20
font_01_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 10180 bytes
SHA-256: 776d8af73991fad8baaf8ac5adc8aec1457c804b1cb94694715d7453f5c57ca9