Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e213ab244e4064…

MALICIOUS

PDF

72.9 KB Created: 2021-01-04 11:15:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7fb3fe3b7c9e9de3de27c96fa0ca0c0a SHA-1: a15646fee305b1c88b011f5a6d7924799345ac86 SHA-256: 85e213ab244e40640e4703a6a20efb1513432ca7baa816d317cfce47311b8cef
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, many of which are hosted on suspicious domains and are likely part of a link farm or phishing campaign. ClamAV and ML heuristics confirm the malicious nature of the document, flagging it as a phishing trojan. No scripts were extracted, but the presence of numerous external URIs suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/aws?utm_term=4+person+best+ball+golf+format PDF link annotation
    • https://cdn.sqhk.co/mugapowejog/fgigggd/nagavobofilawinumisej.pdfIn PDF document text
    • https://wepomifid.weebly.com/uploads/1/3/4/6/134676114/9b99e12f929.pdfIn PDF document text
    • https://lalusaguru.weebly.com/uploads/1/3/4/6/134611329/japinikuluw.pdfIn PDF document text
    • https://sopodepewujo.weebly.com/uploads/1/3/4/3/134340903/8b5b20ad1.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/egfkSql/real_bike_racing_game_download_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5f9c2021e7d3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476580/normal_5fe14affcced8.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/9d405499-1c45-42a5-9700-d9139a62c69e/polk_audio_rti_a7_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e23a48-edaf-4a75-8245-682c189dd31f/15923149219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d317b27-7c8d-4495-9ff9-e45af7e25ee8/sort_toss_roll_nanaimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ea07175-ccfe-4c67-a2eb-748c6c8d34f5/dixexevidesopopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d982df2-996a-4673-9f4d-0f8ab7fdbde3/7506951208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1705bce3-c37a-43ef-b376-de5e3dfcda54/dead_space_2_elite_suits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e79abd40-1728-4429-bd59-a0e3f52fa8a7/42860524377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/480bd01e-e074-44a7-92b8-7279e55a59a1/nizaripafinunujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f36172e-fdd5-4ec7-9216-85e8cc27d8ed/delinuzipanere.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_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 5352 bytes
SHA-256: a7353ec41d303019c99024054f22b8fcf5da7d91502409efadce46ca6f4e689e
font_01_sfnt_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 10520 bytes
SHA-256: 9977560eb732e9b0802704c51b24e91cb4b1172bbefd8889d1ad154bd3b37754

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