Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd6dcec15b8acb6…

MALICIOUS

PDF

74.2 KB Created: 2020-12-04 13:37:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d86d305ddbba03ad32e82cfe7c7847f4 SHA-1: 25e79a234cf12dc9caae4045cbcdb9d1f6468b34 SHA-256: 6bd6dcec15b8acb655299cfa964b73d9f8f680870ea335dcb8ab7b966f4df724
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-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://trafffe.ru/strik?utm_term=super+cat+heroes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454171/normal_5fb882edc7314.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/9622818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_5fbd3e5352147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421207/normal_5fa48b7d63d06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_5f96da2d2c910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422168/normal_5fa050f18c2b6.pdfIn PDF document text
    • https://gisetokitalakak.weebly.com/uploads/1/3/4/6/134600310/9830770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_5faa2406abfd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_5fb47fa384ce7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_5fa07f527409b.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/2292ee37-0091-4a8a-9aef-87988674e71c/zebezawoweto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2641c6f-e1d7-4fb4-9a19-1aa10ede7eba/funniest_pokemon_cards.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_off0000da78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 4820 bytes
SHA-256: 7025ea3f511ac7a4e194a4356dff5a9b95e32623ff7286026dc9b78111e18e71
font_01_sfnt_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 10452 bytes
SHA-256: e0736b3ad913477203b6fda49e2f20fd58bca36341cef984780f95092547fc1a
font_02_sfnt_off00010ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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