Malicious PDF — malware analysis report

Static analysis result for SHA-256 330e8956d58394f6…

MALICIOUS

PDF

86.9 KB Created: 2020-12-29 22:46:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 66d980dd95ab88dc6913ac52f6c8a2b2 SHA-1: e109bb3d776f1c3d666d20db86e3707c8cdd12ad SHA-256: 330e8956d58394f6e888b4520bb53b63b6027342e5fad35e8f4f3f75ecccdc39
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, a common tactic for SEO poisoning and phishing. The heuristic PDF_SEO_LINK_FARM indicates a mass external link farm, with a specific redirector URL identified. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=vomiting+causes+hypokalemia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420612/normal_5fb3449d61e36.pdfIn PDF document text
    • https://cdn.sqhk.co/vemonososepa/ijicibn/magic_piano_pink_tiles_music_game_descargar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5f8a3500d9e4b.pdfIn PDF document text
    • https://lumozilupive.weebly.com/uploads/1/3/4/3/134336046/nevivutujav-gizenanowotir.pdfIn PDF document text
    • https://cdn.sqhk.co/murevexi/hmWhidW/hidden_objects_games_free_online_full_screen.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/nokiva/mirenusafavufopedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3aceab0-141c-4fb0-a1ad-60856313f4be/9227978303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f07176-8919-4f9b-8a5f-c778285b491a/todafanufowuwitibobakafi.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/vejomogaz.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/kimawajakomikirawuxeto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fff7e7f0-061c-4d8e-8e00-8609e94b2a5e/78493260501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c91aa4-2a68-4a41-a2a8-1f22ebe50668/wowiwil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f979ebf8-f80f-4823-a676-2a1b0a7aaae7/kezorufebuvit.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/31879471585.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/stretched_ears_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fdbc60b-c159-425f-a1a6-46d05a1d8650/possessive_nouns_quizizz.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_off000114cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CF 5384 bytes
SHA-256: 0a3f46358ecfcb6c219a6a8d682cafab435df75f8ca074ce17002226f7b14f3a
font_01_sfnt_off00012710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12710 12020 bytes
SHA-256: b23efb9ff9077efb2aed7887df2664d0918ad78c808d99bb8740dc32a59704ad

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