Malicious PDF — malware analysis report

Static analysis result for SHA-256 56aa038a7feaaeea…

MALICIOUS

PDF

80.6 KB Created: 2020-12-22 12:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dc40d25c64377ecc244c8efcd2a50d88 SHA-1: b2fa37e22cb63e0f5101f7d1056a1b5e706a6a74 SHA-256: 56aa038a7feaaeea393e91093a2a118526b80c4be159ad179e334be908749440
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

Heuristics 6

  • 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 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/strik?utm_term=magic+school+story+apk+unlimited PDF link annotation
    • https://sulasaboxa.weebly.com/uploads/1/3/4/7/134767053/a60a32909d26.pdfIn PDF document text
    • https://susokeruno.weebly.com/uploads/1/3/4/6/134656617/kukaxitinutosazafu.pdfIn PDF document text
    • https://degepuwenezeg.weebly.com/uploads/1/3/1/6/131607310/4a07f7c.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/xesuru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471240/normal_5fc582cac55c3.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/7611010.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/miremurelilono.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/6dc46121-abcb-4dc1-9d45-5f4288dab6cc/wuzidadomowusaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8864009-f533-4f8c-8679-d37d3342fe42/17855424239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f70485-84ab-4276-a2af-30e669c416b0/23741995715.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/westminster_chime_mantel_clock_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24a6ed9f-5286-46e4-bc37-738d6b85d21e/27135241688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/679552c6-fdbe-4742-a95a-d82543c748a6/97616700166.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41A 3016 bytes
SHA-256: 2e5edb16b3213aac72f044458146fa31432b4de2d099e09bd529977e30638444
font_01_sfnt_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 5660 bytes
SHA-256: bc6a7b2777c6a30b019aa3b797bac5d05fc508e8d4e3ff27650515f9a51381ed
font_02_sfnt_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 13300 bytes
SHA-256: 9bdad5f4e85c771b9b306334073d29f958a3cbd2814c357e25e4a5244cfa436a
font_03_sfnt_off00011c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 16452 bytes
SHA-256: 4a37d7c72e9a0834475584bd4282704751d8dad02cfbdf7fc34e9d2edfb4b91e

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