Malicious PDF — malware analysis report

Static analysis result for SHA-256 904f098cd709a551…

MALICIOUS

PDF

65.6 KB Created: 2020-11-21 02:32:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 70adaffbb03b6d1d963ed02558678369 SHA-1: c72cfb476f6348010fc55c3a8440b22cf293df07 SHA-256: 904f098cd709a551fac962b612e61a814137bf01231f36e535edc0b1746049dd
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm, suggesting a phishing or scam attempt. The presence of a redirector URL and the ML classifier's high confidence score indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest it's designed to lead users to malicious websites.

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?utm_term=jedi+fallen+order+candle+waterfall+puzzle PDF link annotation
    • https://suduvigil.weebly.com/uploads/1/3/4/6/134697429/xekiromaze_girakisu.pdfIn PDF document text
    • https://vawotitalu.weebly.com/uploads/1/3/2/7/132710714/gunina.pdfIn PDF document text
    • https://lilepixot.weebly.com/uploads/1/3/4/4/134462463/rabarizufizobabogumi.pdfIn PDF document text
    • https://ziwirekow.weebly.com/uploads/1/3/4/5/134529616/ravogojikava.pdfIn PDF document text
    • https://gawubodukajine.weebly.com/uploads/1/3/0/9/130969599/puzem.pdfIn PDF document text
    • https://xazujojupise.weebly.com/uploads/1/3/4/4/134493550/5c1f6c37e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402740/normal_5fa2f9ca2b039.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/tufujifinobiro/kubifuxinakis.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/android_sdk_manager.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/picadora_de_maiz_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/celsius_to_fahrenheit_chart_printable_compact.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/tenixiga.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/creature_movie_songs_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/be_unto_your_name_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/stomp_by_kirk_franklin_lyrics.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_off0000c68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68A 5100 bytes
SHA-256: c5fd068d91266efbcea2f5c699a7eb72da789a7fdc672b9bc1f8976bf312b81b
font_01_sfnt_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 9628 bytes
SHA-256: 90207d96e3cb0a43edb0413bea29f3eac2c4bf1c88e2e4d4f1d3fd7115a6c313