Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9d176a8c6bf5c0…

MALICIOUS

PDF

62.1 KB Created: 2020-11-17 20:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: af403a9c675d286bad4586d1a20efd7d SHA-1: 95e73cca643a53ae939f4aed5f68a19710ae6468 SHA-256: 8c9d176a8c6bf5c0649167ee45e793bd510be93d0ab89690d0cb4057bd613528
156 Risk Score

Malware Insights

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

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 0.9995

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=adventures+on+dungeon+planet PDF link annotation
    • https://pawusimogi.weebly.com/uploads/1/3/4/4/134444718/1633251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_5fad3412c7512.pdfIn PDF document text
    • https://padavosasosak.weebly.com/uploads/1/3/4/6/134632247/5602230.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/5387279.pdfIn PDF document text
    • https://puwevifu.weebly.com/uploads/1/3/4/4/134465284/0527fe53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f97f2e-3d24-408a-a42f-e61f26546c99/Weihnachtsbotschaft_an_Schler_vom_L.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/zeguzewonizifaxodonuwet.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/baldi_s_basics_mod_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/vakitivarunemizobor.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/punibevusetukesam.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_off0000b63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63F 5176 bytes
SHA-256: eee327df57e4e9a1bcac7edc8462ab86cbb0d7572cab2c5a4f81bdd6e9a83906
font_01_sfnt_off0000c7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F4 10580 bytes
SHA-256: 30d4b7affb2bc230cde72edfebcaf06b0cd3aa50438b061fbf860f9309ddf9bc