Malicious PDF — malware analysis report

Static analysis result for SHA-256 1daa7ac9e5d2e244…

MALICIOUS

PDF

75.7 KB Created: 2021-02-10 20:04:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8af8a21c50adf6ace288e2b3ca587363 SHA-1: 692a3e0be833cffac36c5366ed595beb3bc36819 SHA-256: 1daa7ac9e5d2e2449bb7e75fa5756605cfd4066cb02a4be38df948007b50e096
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. The document body, though heavily obfuscated, appears to be a lure for downloading content, likely leading to malware.

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://jacksth.ru/123?utm_term=retrevo+user+manuals PDF link annotation
    • http://stebsmeh.space/the_adventures_of_tintin_2011_trailervfww5.pdfIn PDF document text
    • http://tesar-krd.ru/binenixopef662b1.pdfIn PDF document text
    • https://bogogumufen.weebly.com/uploads/1/3/4/0/134018830/97bcc.pdfIn PDF document text
    • https://nuvafuriwevejuf.weebly.com/uploads/1/3/2/8/132814848/bemukixuj_dovilure_josevozerujepak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445331/normal_5fce8bde1141b.pdfIn PDF document text
    • http://xteenware.online/beginning_algebra_9th_editionpr3tp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390069/normal_5fca04bcc213f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383702/normal_5fe17128973c1.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/xeponodij/razir.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/kane_brown_heaven_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/android_9_keep_apps_running_in_background.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/behavioral_science_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/dawelazuf.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_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 4900 bytes
SHA-256: 20307f02a3caeea035fc4a685b51b40fb61af277263296d85ab3df5144bc1fdb
font_01_sfnt_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 10868 bytes
SHA-256: 063e51d1d10e6afb6842b4a0f098fd4612ebe8aadc8a4ba0bd12b34d21120d31

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