Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc78e148b6e99baa…

MALICIOUS

PDF

73.7 KB Created: 2020-11-24 02:07:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 706a1d4051d3c34406884e78c35937da SHA-1: 8535ee0955a4a7cbf082badc95f8735eef729add SHA-256: cc78e148b6e99baa539a9dbb7cbfc8830e7e50f3649f949f55a3fe0d553a647f
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?utm_term=the+bureau+xcom+declassified+mods
    • https://matazesugol.weebly.com/uploads/1/3/4/7/134702103/745209.pdf
    • https://cdn-cms.f-static.net/uploads/4449622/normal_5fad41a760d8a.pdf
    • https://cdn-cms.f-static.net/uploads/4387033/normal_5f94334a16504.pdf
    • https://cdn-cms.f-static.net/uploads/4421039/normal_5fadc7f4d5283.pdf
    • https://cdn-cms.f-static.net/uploads/4501993/normal_5fb41e78222ba.pdf
    • https://cdn-cms.f-static.net/uploads/4421957/normal_5fa8194009738.pdf
    • https://zolegezuboz.weebly.com/uploads/1/3/4/4/134462972/mupaso.pdf
    • https://xojoguxivizu.weebly.com/uploads/1/3/4/0/134096407/95fd165fb1b.pdf
    • https://judemozosuduj.weebly.com/uploads/1/3/4/3/134306717/fca0465.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7768da56-63fc-42a4-bd88-f51e094342f7/gmc_repair_manual_torrent.pdf
    • https://uploads.strikinglycdn.com/files/f517b8da-4a7c-404c-9248-04634e75e04d/coc_base_building_guide.pdf
    • https://uploads.strikinglycdn.com/files/fffe0685-7a35-4bac-a438-a387b03bee9f/putlocker_avenger_end_game_watch.pdf
    • https://uploads.strikinglycdn.com/files/b0937e2e-2709-4fca-8d92-8a0cd442b318/65158676981.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccf8.bin
585dadef46f65ffa1f60bd51e4802880d72db89cdc7bb25b82d715f4a64af044		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF8 5416 bytes
font_01_sfnt_off0000df37.bin
7c4c9db429275ac919c13cc011108c339e6d84c9a7cb7f491cca1b368bc86237		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 10720 bytes
font_02_sfnt_off00010419.bin
91c92fab729f552433758475f1ecf6a366c66c74ae6b4dd9e31a9a0100f2b42c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 16332 bytes

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