Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb39fd98d0eab764…

MALICIOUS

PDF

76.2 KB Created: 2021-03-17 03:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d8fc7405cd1884bac214c39d51d5eefe SHA-1: dbee16ec3f55d85c94f7ac3d833275576307c558 SHA-256: eb39fd98d0eab7647cd753f1ce4b09632365af9702ed6d380846c8d590056321
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, with one prominent link pointing to a redirector URL that appears to be part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'medical assistance in dying alberta forms', likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/123?utm_term=medical+assistance+in+dying+alberta+forms PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451954/normal_5fdc75bd8b678.pdfIn PDF document text
    • http://jiwabozaxexe.mypressonline.com/zezugowanobidus.pdfIn PDF document text
    • http://sudilufib.getenjoyment.net/what_are_the_main_concepts_of_oops_in_java.pdfIn PDF document text
    • https://direnebem.weebly.com/uploads/1/3/4/6/134641367/murevugig.pdfIn PDF document text
    • http://gavediteriremuv.medianewsonline.com/3479871416.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/98816598571.pdfIn PDF document text
    • https://sasurejif.weebly.com/uploads/1/3/5/9/135966776/gafesabexefowolo.pdfIn PDF document text
    • https://gekojufoj.weebly.com/uploads/1/3/4/4/134438070/vomikunipomi-jawazev-birokefegi-xamegi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501201/normal_5fc611c415b6b.pdfIn PDF document text
    • https://soliduratop.weebly.com/uploads/1/3/2/3/132303261/9406860398a6c.pdfIn PDF document text
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/bexujexuwojop.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/litunux/40167254725.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/capture_one_touch_canon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a902b49-e5ce-453b-97fd-94e593608e25/56227354132.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/63932788753.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/iphone_app_store_apk_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff6ae6b-983b-4e0d-9b01-9ba21cda661f/83560029234.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/17215475636.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/bewumam.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/xowuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/514c8e64-bf03-4364-aa93-00f73e17e929/23577339875.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_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 5588 bytes
SHA-256: 7a5b1bb003041d34dbb1a6e65b5f26e57f9d9ab0b3b6a2f7d6a38ea6eff7999d
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 11080 bytes
SHA-256: e07941e72f7d4104a515b4a96a88f765f8c580b2245e59a3790b208553b3891b

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