Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96a552d5aa65e0b…

MALICIOUS

PDF

74.9 KB Created: 2021-02-28 21:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2a108473b243a20202ae57ca124e9b33 SHA-1: f67c258b6f8309074e781b0fc6cc16ce13171fdc SHA-256: f96a552d5aa65e0b085bda68ff2d22a2c4aaf730b1b161e2135457ff5a657c6d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicative of a link farm or SEO spam operation. The ML classifier and ClamAV heuristic strongly suggest malicious intent, specifically related to phishing. While no scripts were extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious or spam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=ncees+fe+reference+manual PDF link annotation
    • https://lakomefolowe.weebly.com/uploads/1/3/0/7/130776578/69d1ff4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407729/normal_5fe5f19f2f3fd.pdfIn PDF document text
    • http://pojegan.22web.org/how_to_use_self_clean_on_ge_true_temp_oven.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/does_vroom_negotiate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_600f185702514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458840/normal_6018680fe30ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407777/normal_5fe7c8a4e7d84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_60356a930e1eb.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/fawezetajezutujamasixuned.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453553/normal_5fe4c53599198.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410989/normal_5fec3cfe3ab3a.pdfIn PDF document text
    • https://moviwinexanasi.weebly.com/uploads/1/3/4/3/134314602/4920451.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485578/normal_5fd07bd26861b.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/biwubeleba/93023407007.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/21197328509.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/cognition_exploring_the_science_of_the_mind_6th_edition.pdfIn PDF document text
    • http://jiporiri.rf.gd/zoom_g3xn_multi-effects_processor_review.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_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 4996 bytes
SHA-256: 0260a2cd2957733f1bea35afc863c082428cc54a913c1ee9ab5b11a6995ee3a9
font_01_sfnt_off0000fac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 10504 bytes
SHA-256: 70ecfc54ae934019f4dd1138b49b8a80c119b08b5360c620bad1a1bababc70ee

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