Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b23a8dfc2a408c…

MALICIOUS

PDF

67.3 KB Created: 2020-11-14 12:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 53f3e9a4b7a709cd3ed28edea1ab0261 SHA-1: bab276c3b4a9265f976e3d8535934589a3d093f3 SHA-256: 64b23a8dfc2a408cc4648202a9802e400ac0a920975a5ded80c2b316820941b4
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=masterbuilt+30+electric+smoker+recipes+youtube In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_5f8bdfb7ee8db.pdfIn PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/pekukipuvi.pdfIn PDF document text
    • https://dijumigomeruke.weebly.com/uploads/1/3/4/3/134309809/2e192fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421333/normal_5f9c5eed3ec95.pdfIn PDF document text
    • https://juvudunepuzuvo.weebly.com/uploads/1/3/4/5/134513453/puxuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_5fa32de056add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389108/normal_5f9af1f8313e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426679/normal_5f9d21fc2dfee.pdfIn PDF document text
    • https://jabiratunibi.weebly.com/uploads/1/3/2/6/132683422/xabejodaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451575/normal_5fac05bc9128d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_5fa27910897fb.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/pizivurapab/wenilufuloriw.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/carbohydrate_chemistry_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tefelaj/minecraft_redeem_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/mutuk.pdfIn PDF document text
    • https://s3.amazonaws.com/nozazodivin/wesoxuwof.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_off0000c9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B5 5696 bytes
SHA-256: 564495dcbfc470f1543d1e0caf73896553a0be60ec5d79a932ca918e16e909dd
font_01_sfnt_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 10256 bytes
SHA-256: 5d2c8428d2cc6835f1baa28b85260bb52cf3f2eecc7ee1c82cc82e9cba7c08d4

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