Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0bbee781f95acd…

MALICIOUS

PDF

107.8 KB Created: 2021-01-05 23:32:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 75c1d1959a548a309c1d917750d7ac42 SHA-1: e7dc089c91070fd89fbfdc0ebe110e30e7f64f8a SHA-256: 2b0bbee781f95acdd26e934c51dd5803804a660ee6543e9f4df3e6f881fa35f6
126 Risk Score

Malware Insights

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

The PDF was identified as malicious by an ML classifier and contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate potential for redirecting users to malicious sites or further payloads. The document body appears to be malformed or obfuscated, preventing a clear understanding of its intended lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://trafffi.ru/123?utm_term=watkins+elementary+school+wylie+tx PDF link annotation
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/wikuneve.pdfIn PDF document text
    • https://cdn.sqhk.co/nerenina/jcgjcBa/65149965639.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/c3hhujj/boxing_physics_2_hacked.pdfIn PDF document text
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/0f2479eb08.pdfIn PDF document text
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/jovijokulodarufaji.pdfIn PDF document text
    • https://kudowelevuk.weebly.com/uploads/1/3/4/5/134585456/nubazejuwugikobe.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/jckWhfp/funny_message_sms_ringtone_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5f89669d9a1a3.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/JgijgB4/ball_obstacle_course_game_app.pdfIn PDF document text
    • https://reluxepeguru.weebly.com/uploads/1/3/4/3/134363030/xupiviwev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/54276014031.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/sonogalefilonelare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e1bd2f-fccf-4113-bb19-9a6be5fe37aa/48808537000.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_off0001682f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1682F 5376 bytes
SHA-256: b705cd8b4078554230c16c4e7b797d60574a9bc5b48718437d9b83d9835491c5
font_01_sfnt_off00017a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A6E 12188 bytes
SHA-256: 9ed05ebbc932a2713dfa0acefd2da5a6d14bb3dd08639d17a0616b6bedbea1aa

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