Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f873a02f5c7c058…

MALICIOUS

PDF

79.1 KB Created: 2021-04-04 18:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89c560f8926964f07c930fd71ea7eb93 SHA-1: d3dbb63608306ee3b01dd89f4987d0cbb9030318 SHA-256: 8f873a02f5c7c0587654631f335215511e010ca91638753d6ccbdb04d4a2a317
156 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains a large number of external links, indicating a link farm or phishing attempt. While no scripts were explicitly extracted, the presence of external URLs suggests the PDF is intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/wix?keyword=autographs+price+guide
    • http://jobware.pro/how_to_reset_samsung_washer_door_lockedfw492.pdf
    • http://stakingyfi.com/organic_chemistry_basics_ppt7pcd5.pdf
    • https://cdn.sqhk.co/xupumekejaxa/dgf9hak/jopigamokaselapafuzuki.pdf
    • https://cdn.sqhk.co/dikulodut/hieKjaD/bipagilovelidexaxujapowet.pdf
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/461613a5b4b0a6a.pdf
    • https://tuzutetenufiro.weebly.com/uploads/1/3/4/7/134716615/vikuj.pdf
    • http://mklhhhh.space/fitusovapirubqv17.pdf
    • https://fujowutel.weebly.com/uploads/1/3/3/9/133997949/5965a6d7bf7e4.pdf
    • http://agencymedia-ig.com/lolonezeweladagawurowgv7m4.pdf
    • https://cdn.sqhk.co/pifonode/rjbgiii/museb.pdf
    • https://molulodanewiv.weebly.com/uploads/1/3/1/6/131606256/2548584.pdf
    • https://mibelovo.weebly.com/uploads/1/3/4/6/134608705/7601107.pdf
    • https://xefesikixote.weebly.com/uploads/1/3/1/4/131437823/4289847.pdf
    • https://vezerovir.weebly.com/uploads/1/3/4/5/134580053/zesuja.pdf
    • https://tajuboramaze.weebly.com/uploads/1/3/4/5/134591815/d12c18eed331.pdf
    • http://testvvd.xyz/samsung_gt-p5113ts_specs3phlb.pdf
    • http://good-production16.site/zilebirnwyh3.pdf
    • http://shoppingyxplus.xyz/free_music_im_callin_youam9md.pdf
    • https://jixepelisu.weebly.com/uploads/1/3/2/6/132695865/abb991d0405.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_ec550be1c23542949e5cef8ca381c2aa.pdf?index=true
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_08bfe44e2a35407cb7ceb321d02be590.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f644.bin
6b07b77467c08b37bd793f4d7c3598b31c022c456ca8c1388f9bf79372c4acb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 5292 bytes
font_01_sfnt_off00010841.bin
ade0de3a106dfbcf53625913a77d1f850f6d66c45ee74e763507248cc2658567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 11636 bytes

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