Malicious PDF — malware analysis report

Static analysis result for SHA-256 f906ed7f945dc647…

MALICIOUS

PDF

74.4 KB Created: 2020-12-27 20:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 516fe0b5354ba710cf2ab644f51d96e7 SHA-1: 9d07671f9ac5b40edc699f9e0675a9ad2fbdfafe SHA-256: f906ed7f945dc647f1aeebd72222c7d30c46da3166e415bb3378dbc3d73ea1ae
156 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 0.9998

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://trafffi.ru/strik?utm_term=easy+eggless+chocolate+cake+recipe+without+oven PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5fa634931402d.pdfIn PDF document text
    • https://cdn.sqhk.co/sepunaro/giibqii/72152569459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5fd0ff461ef3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5fbfa7c7c808b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_5fb56933ca7ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377678/normal_5fa0a84c12def.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/jathh3S/tap_abbreviation_medical_term.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5f9e3c8820597.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/hjgdqGr/happy_birthday_wishes_for_sister.pdfIn PDF document text
    • https://cdn.sqhk.co/lukedivibeb/jbqZjaW/96642649394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_5fab3e6be9490.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/cb5d4.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuzini/4jihwLo/lajokepadezugedari.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ffd84c75-632b-439b-b9ee-859b4c8fb2ec/primer_aviso_me_vas_un_pagar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 5352 bytes
SHA-256: 3376a4d408e55f83d5a66f2207ffb17bbb3866c6154dabc61b03d3a94aee4a5e
font_01_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 10336 bytes
SHA-256: 97f2432a246f71e329666387e82dc8e1ea4cacb1d46633c99e4258719ba9ce8b
font_02_sfnt_off00010e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E76 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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