Malicious PDF — malware analysis report

Static analysis result for SHA-256 de13f3bf413fcbfb…

MALICIOUS

PDF

67.6 KB Created: 2021-01-04 09:16:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 708e2d23ed5ee6116f66ff9010590468 SHA-1: cf1a7e6d5ab4acdd70178132a3e9d566119dd220 SHA-256: de13f3bf413fcbfb349992834e4b23b2647a6c1d40aa9464820273d04d60cddc
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 as a PDF link farm, pointing to various PDF files hosted on services like S3 and Weebly. The primary URL, 'https://traffking.ru/123?utm_term=supima+cotton+sheets+vs+percale', suggests a lure to a website, likely for SEO manipulation or to host malicious content. ClamAV detection and ML classification confirm its malicious nature, indicating it's a phishing or trojan distribution attempt.

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://traffking.ru/123?utm_term=supima+cotton+sheets+vs+percale PDF link annotation
    • https://pawusimogi.weebly.com/uploads/1/3/4/4/134444718/sutifezesazabasapu.pdfIn PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/mubikinil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_5fa330b25ad70.pdfIn PDF document text
    • https://xafudilolara.weebly.com/uploads/1/3/4/7/134744509/bakop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f8703bb66e18.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/damerirazib/kusojox.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/aamc_practice_test_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/yuzuriha_unist_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/free_filipino_movies_2020_full_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/maths_formulas_class_8.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/bleacher_report_football_facebook.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/58458623876.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_off0000cbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 5336 bytes
SHA-256: 996f85be09d2901c4bd4a15d9dcda8161c115d37797a5ffcd56d2f67574c7d03
font_01_sfnt_off0000ddd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 10636 bytes
SHA-256: 4f3b45792a3fe9c86fd25bd87417e8112600bae73ce3e68446839908ea5f7e69

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