Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88504a84473d8b2…

MALICIOUS

PDF

66.9 KB Created: 2020-11-10 10:14:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fbcf0303a290a06e678d40ccec68843e SHA-1: b59987e6fae9576d54c9d0b9fd344acdbc97c5ce SHA-256: c88504a84473d8b220d71471455d5e3eb42494811854c5b3c9b102c3dff93a66
196 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 point to SEO redirectors, indicating a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK strongly suggest this. The embedded URL https://trafftec.ru/123?keyword=upright+citizens+brigade+matt+besser is likely part of this malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a malicious intent, likely for phishing or malware distribution.

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://trafftec.ru/123?keyword=upright+citizens+brigade+matt+besser PDF link annotation
    • https://jenititufevi.weebly.com/uploads/1/3/4/5/134595561/tusenesisekuduwed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494663/normal_5fa9d1c91aa37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410714/normal_5f94e1db21d7e.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/5293624.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/669e2446-0fa9-4f2f-9436-7122b5e6a58c/home_access_ccsd.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/english_to_odia_dictionary_download.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/kasepor.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/57215375526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c5359f-de5b-41fd-9e4c-99aea6ee5bac/75108966979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad64609-abd2-4a2d-9f8c-520a248762bb/apple_store_demo_screensaver_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/gasodagu.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/air_pressure_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/futasodol.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/chronicles_of_darkness_rulebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5803eb6b-5954-49c8-9787-a332bfe73c19/jigazejazilufor.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 5636 bytes
SHA-256: cbb00e88a88cfc3ba65185d9f97f24443473669d1376475f8ba4adeab512b97c
font_01_sfnt_off0000d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 10712 bytes
SHA-256: 2f641f6227fc68c34b7c3f5809f97acc20f19ed4166ed55e3c11d05315917b7c

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