Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a2103719588d02…

MALICIOUS

PDF

72.0 KB Created: 2020-11-20 23:57:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f2cb9697ab6de82b7d44d798980f6c51 SHA-1: 71ba681e7747ecab034cb0e067eab8c4eba52e65 SHA-256: 95a2103719588d023d42080bf050ac9bea74fd75ed622c22005b0236bbd3db1b
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with critical heuristics indicating it acts as a redirector to malicious infrastructure and a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://cctraff.ru/aws?utm_term=priest+leveling+guide+ragnarok+m In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_5f94a12bb2456.pdfIn PDF document text
    • https://nikotegonekis.weebly.com/uploads/1/3/4/6/134628666/6028326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427526/normal_5fa1f6a225bd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418777/normal_5f9626966b390.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/vozetovuxukelul.pdfIn PDF document text
    • https://veborikaja.weebly.com/uploads/1/3/4/3/134317734/vufizob_gezujafofuzipuw_minabovi_vivazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453908/normal_5faf577445772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_5fa64062e3ea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_5fa85a0fa7659.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/dudigonifu/eureka_math_grade_1_lesson_14_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3ccb1c-68be-4309-bce0-35b7d768687d/7602405746.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/sample_answer_to_ud_complaint_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5413388f-93f8-40bb-b6cb-510b3af7792c/rixokusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a55a14e-292d-4a24-896a-e96ebb5f1efe/powugewodujijenero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a919eb-153c-4a15-938b-15f3f048f9b4/xadigagewunotezanuzeju.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_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 5268 bytes
SHA-256: cfb6a8cd6263d2523e34db3ad917950a123998a5e9d9403623e72437bd0bf2ae
font_01_sfnt_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 11512 bytes
SHA-256: aed67c2d8575efca4803e73f4a171b62dec1a999a74917aafe821e6eb0e8530c

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