Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b32b02a1b448f5…

MALICIOUS

PDF

63.6 KB Created: 2020-12-18 01:46:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5821620d473c6981d5984664aa2bfc3e SHA-1: 25fc81b50f1aee1abcbcf5d5dc86521d35dd28e3 SHA-256: 27b32b02a1b448f5d7628a49bf1bbd716421bd9ab3191fc91d856d54b84f500e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://traffking.ru/aws?utm_term=input+attributes+in+html+form, suggests a potential phishing or traffic-driving scheme. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/aws?utm_term=input+attributes+in+html+form PDF link annotation
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/papurapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5f8e03619c111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5f96bd3581fca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f88b1a2ce798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_5fadaa1f48b2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422385/normal_5fa5bc2f67365.pdfIn PDF document text
    • https://posuzelivoj.weebly.com/uploads/1/3/4/8/134869480/kekodisutopogututefo.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/wulotugadag/vevade.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd05df72f8b574a0f48a66/1606223329562/87263748360.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/little_alchemy_2_guide.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_off0000bcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFE 5216 bytes
SHA-256: 83fb8ac007756dae1c2882f1afa03886c31e499f688f5ca12946863499d42f2e
font_01_sfnt_off0000ce8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8D 10432 bytes
SHA-256: d7ff28de10ce066f4dbde9853f0480b71bbf30ab5a8e0b750adb518d06f3a554

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