Malicious PDF — malware analysis report

Static analysis result for SHA-256 4961f7efc8126218…

MALICIOUS

PDF

112.7 KB Created: 2021-01-05 18:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6491d511341a8d5d99a78ae75ef72cf6 SHA-1: 1e76553cee439413842c6a7e89f57823a865da1f SHA-256: 4961f7efc8126218677256a9ecc2ae62f1bad1968c2836f1a906e07bbd243c23
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm are indicative of a malicious document, possibly leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/123?utm_term=big+farm+mobile+harvest+offline+mod+apk PDF link annotation
    • https://wazijewafaset.weebly.com/uploads/1/3/4/4/134437152/5020383.pdfIn PDF document text
    • https://sutukedepebovi.weebly.com/uploads/1/3/4/7/134753024/9c395b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413585/normal_5feeaa7f4c768.pdfIn PDF document text
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/fuximav.pdfIn PDF document text
    • https://fezewozigu.weebly.com/uploads/1/3/4/3/134318815/sabid.pdfIn PDF document text
    • https://bigorofepomibed.weebly.com/uploads/1/3/4/4/134400252/5964151.pdfIn PDF document text
    • https://weduzoviduluwiz.weebly.com/uploads/1/3/4/3/134385862/7522579.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/CrgcghS/medieval_war_hammer.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/4958130.pdfIn PDF document text
    • https://roromitekavu.weebly.com/uploads/1/3/4/5/134528712/xarerijure_rimeva_vifazusawidafiz_komawe.pdfIn PDF document text
    • https://kewidanuratug.weebly.com/uploads/1/3/5/3/135323433/telivilavujak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464311/normal_5fc5f272873d3.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/zukogi/nixijewej.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 5768 bytes
SHA-256: c0a610c8cfb65cb2ef2aee57151d6a77bb79b4d7e03ac662243d7354e6df2fe6
font_01_sfnt_off000103d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D0 40196 bytes
SHA-256: 47d62dcfb4a7f8db7583f31ef6ff0aba265e14b50edb9ec198336a4459fda7aa
font_02_sfnt_off000174f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174F7 10760 bytes
SHA-256: 4fd8f81a70f364204c5b1931a759d388c903bf174d8a3df6557160805cb77df1
font_03_sfnt_off000199e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199E3 17864 bytes
SHA-256: 65d8f3f8d3892553266abd41936c44fdff4a6282a729497c3813da1c662aeeb4

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