Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34baf1d83526801…

MALICIOUS

PDF

71.1 KB Created: 2020-12-26 17:13:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: da607677b3aa0a01eb3158d8cc0fa2d9 SHA-1: 99c7569c3c44a210e0728a21ad56196309630cbe SHA-256: c34baf1d83526801df9fc299f93a415ffc6dd5217cc50ac2bd906e39d2558512
244 Risk Score

Malware Insights

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

The PDF contains a large number of links to external resources, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as a phishing trojan. While no scripts were extracted, the structure and heuristics strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://ggtraff.ru/123?utm_term=american+government+chapter+5+political+parties+test+answers In PDF document text
    • https://kutowovazamil.weebly.com/uploads/1/3/4/3/134362820/sovaw-zajikazukukefog-nojibex-donidavekunotav.pdfIn PDF document text
    • https://jololese.weebly.com/uploads/1/3/4/5/134599323/5964806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374980/normal_5f987615e0b12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5fa06b9a05ad8.pdfIn PDF document text
    • https://bidutujube.weebly.com/uploads/1/3/4/4/134403342/musejoponenem.pdfIn PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/bajox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476446/normal_5fe319adef03e.pdfIn PDF document text
    • https://fejisamuzek.weebly.com/uploads/1/3/4/6/134636520/nemijobibi.pdfIn PDF document text
    • https://sekekipozikevaw.weebly.com/uploads/1/3/3/9/133997985/bc81cf79.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://s3.amazonaws.com/pibabopuduj/niviv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c5bd52-12cd-4cf4-8147-32857dc3679d/kid_o_trike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd8690a8-b620-42ef-b7cc-52b405216279/nar_shaddaa_kotor_2_lightsaber.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/adrenergic_and_cholinergic_receptors.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD6 5400 bytes
SHA-256: b22941f6838bc02c7a16a00c70a5d1df431461fdc82d8ae2649945473e831628
font_01_sfnt_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 10228 bytes
SHA-256: cba86f665dc2371afa080ae21c2a4e30487d529f4ec4f2e1a66d16932ee96190
font_02_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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