Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c314f72ac08a68…

MALICIOUS

PDF

74.8 KB Created: 2021-03-24 03:39:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2dbf278c57b7a7224a7a346a662f06b9 SHA-1: dd110941d0fdd0c78a60ded23b7846ea1ab67124 SHA-256: c3c314f72ac08a688493f10f485dbebfd4862046ff968ad2ec6379f0d0ed2829
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://golowaki.ru/wix?keyword=rainmate+air+purifier PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463559/normal_5fe6fdcd412ce.pdfIn PDF document text
    • http://goshop32.site/28959587837zdftg.pdfIn PDF document text
    • http://copyright-infringement.business/gesodadewitagy7rjq.pdfIn PDF document text
    • http://digitalmedialit.com/4661440675732y86.pdfIn PDF document text
    • https://cdn.sqhk.co/mizaveteg/icjgjjh/sojefejudogasimuzaduvazan.pdfIn PDF document text
    • http://freedate18.xyz/partnership_deed_in_gujarati_language98k7u.pdfIn PDF document text
    • https://mizavujubamu.weebly.com/uploads/1/3/0/7/130775062/lavobega-dajuzabe.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/hudhhij/junowep.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/weduzofajozo_leloxekatexo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471249/normal_5ff54699b5636.pdfIn PDF document text
    • http://zeropium.com/bekufejesikuzitp4oxh.pdfIn PDF document text
    • https://cdn.sqhk.co/vakujediraw/nhghihc/89506950650.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/toliwudalamem/92447883377.pdfIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_a46955e47a944a1d814fc0fa572d9301.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zopenave/27903047736.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/bigogoruruxetesepabugovi.pdfIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_7dc18bd175314bc6b02a6da5fa1fbf32.pdf?index=trueIn 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_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 4844 bytes
SHA-256: c3f2383dd1b8074e96af294c593edfbeb4574abee2528e5cd363b052c1edbf0a
font_01_sfnt_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 10468 bytes
SHA-256: fe6d5097b6c2a15612d28f416a8802a01e77b82b178531eeffc6aae9babb12ba

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