Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0d108f62379c3a…

MALICIOUS

PDF

74.0 KB Created: 2020-12-19 12:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 77114b079d3b4e1dc683cb8097e19c1b SHA-1: 97fdfcb81d5ea93db887d426f99581399080dac8 SHA-256: 3c0d108f62379c3a9258b9059d8413c3de7eb085df64f79e9f2b3c6a1f83d701
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('trafffe.ru') and a query parameter suggesting a lure related to 'Nintendo Switch games'. Heuristics indicate this PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, likely a phishing or trojan distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://trafffe.ru/aws?utm_term=nintendo+switch+platform+games+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495039/normal_5fd2e6f2ad296.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484376/normal_5fc711be330de.pdfIn PDF document text
    • https://jotujovogubiraf.weebly.com/uploads/1/3/4/6/134627891/zolanukugakopelamex.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/zudivomebavef_mejomu_keludutik_gexino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424037/normal_5fa37c363df04.pdfIn PDF document text
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/3115634.pdfIn PDF document text
    • https://pudafakomixi.weebly.com/uploads/1/3/4/5/134506615/lemapuvi-welonutolonubos-wegepolewupaxet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465701/normal_5fc7481d4bece.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/sifawekujiki/wobavena.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/roku.com_link_activation_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83676a58-7f6e-491e-91af-9581d9c92ca7/mosalefarovadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ddd5330-651a-4f77-be66-6e62f35ff072/rotidadijawutazuf.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/jitimawopimuzaxo.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_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 6112 bytes
SHA-256: 07cd1a8a7d415e84e2f251fe9f38714a3bd26af2e0436fd0455c3504faea5e31
font_01_sfnt_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 10576 bytes
SHA-256: d5882fe743af1d1428b228ba45b959fecc1a98b7b102162924e421052e82d56b

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