Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd25d26de86288e…

MALICIOUS

PDF

114.2 KB Created: 2021-03-19 22:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fbbd178830e470f327d2d9be1de672d5 SHA-1: 9d54718a9b0d34acef67d907faf0d09ed25e0e34 SHA-256: 6fd25d26de86288eaf2cb993ecc67c7b43c6961308d4587d158b326db0bf73ab
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=sportdog+nobark+sbc-r+rechargeable+bark+control+dog+collar+reviews PDF link annotation
    • https://zikepasut.weebly.com/uploads/1/3/4/1/134108801/9430755.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/CsxH1he/classic_chess_openings.pdfIn PDF document text
    • https://pupuzufasu.weebly.com/uploads/1/3/4/7/134759867/0e117a8.pdfIn PDF document text
    • https://fusasevamasaxig.weebly.com/uploads/1/3/4/8/134866100/486000.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/3b53e1.pdfIn PDF document text
    • https://rugepokowefi.weebly.com/uploads/1/3/5/2/135294276/c9ef075547f5b8e.pdfIn PDF document text
    • https://jesiwiluvilad.weebly.com/uploads/1/3/1/8/131857580/0528d8ff054c685.pdfIn PDF document text
    • https://ruregojuze.weebly.com/uploads/1/3/2/8/132814589/peguzilepiziki_lodulipe_fomuxigifis.pdfIn PDF document text
    • https://cdn.sqhk.co/pifizumux/jhIZhgo/70332611711.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/aiaSjiK/pong_classic_table_tennis_the_same_thing.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/9db61074-d001-4a2d-84e8-35f8289a4ba6/alinco_dx-sr8t_vs_dx-sr9t.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4baa1bea-fea4-4ee9-8653-7fe9d06eea30/how_to_change_the_code_on_a_kwikset_powerbolt_2.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/nedapirofonifegejoni.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/2999679596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f9cd95-20fe-45c4-ab95-6f41603df32c/what_old_movies_are_on_hulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05771750-0419-4e88-a4fc-8a3856c826f7/brs_pathology_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddf80869-8b8a-4157-a114-2c4ef8aa8d92/discipline_and_punish_the_birth_of_the_prison_citation.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/vuxoloxelulegasadorugot.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/wamereligilufavosoluzapo.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/how_to_fix_e1_error_on_haier_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/35160302872.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/giwuzomutesow.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_off00017b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B1D 5828 bytes
SHA-256: 543767c58263abf19f49a1f98095f97a05686a8a6aeb0031d7ca4afdbd818759
font_01_sfnt_off00018f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F03 12268 bytes
SHA-256: 126c7adc22f855d2c222693cbf0878300d5fe0d6b90c0778ed6e912a3fa453fd