Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd75845c44448a18…

MALICIOUS

PDF

77.9 KB Created: 2021-04-28 04:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4b2a2e432e22e9a0e8417a0cbe19e7dd SHA-1: 1a7e7554df4661440e8df9eeec4e99254a8b514c SHA-256: bd75845c44448a1862edcaf022ba1bcf37a44ceec5ba21bccd2b0049286e1450
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were extracted, the structure and link farm nature strongly suggest a malicious intent to redirect users to harmful sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=mini+dvi+to+hdmi+adapter In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376371/normal_6030d12ac97ba.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/c2jakjf/90463012098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_600e4412ae4af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411717/normal_5fcf18ec89729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424682/normal_6012f923e98df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_602f4a0cc08b4.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/dhiifs3/rts_tactical_armor_bundle.pdfIn PDF document text
    • http://jaraxusej.iblogger.org/agriculture_ecosystems_environment.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
    • https://uploads.strikinglycdn.com/files/8ed45d5d-e591-40b2-9966-736cef9897a0/gunifexawivogugabivor.pdfIn PDF document text
    • http://vezuzatutuxi.epizy.com/56244059226.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/commutative_property_worksheets_first_grade.pdfIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_cff6733dbc67483fb259eead7517e6cb.pdf?index=trueIn PDF document text
    • https://a763ebd9-c18e-43e0-89ad-bff0d4d40701.filesusr.com/ugd/2e16aa_15d49040fb4c4cb6a19867cae08267c0.pdf?index=trueIn PDF document text
    • http://silutopedap.rf.gd/nadowevupunujexazefugovi.pdfIn PDF document text
    • http://kunilupef.rf.gd/ca_foundation_syllabus_books.pdfIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_5670c8b341e942a59e1393e7d420c63f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/divixeledoxelowekeraw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b37356-1676-47ce-9520-ed83d4fe2870/how_to_connect_jabra_75t_to_ps4.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_cbcb9d3a40594a2ea7b187e5d4544415.pdf?index=trueIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_e71df0d337854386897a84f9e6c057d4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 4840 bytes
SHA-256: b29ac89e8ceb05c2ee11913cef0587f666c1e030990a1799f2d4e5ddcc312dd8
font_01_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 10604 bytes
SHA-256: dc9b1c781b156cf75205cc9fc756e993ea79a18553fe99c6851a4c31981348b8
font_02_sfnt_off00011beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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