Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bc61d6fe7a1b56…

MALICIOUS

PDF

72.8 KB Created: 2021-03-13 17:25:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd0a468435834b14b29d2305c536e4d8 SHA-1: 9662aa02f3dbc436b74d6c8bc662812f92699784 SHA-256: 83bc61d6fe7a1b56a35995b7b2e10cb306d21603cd5f3b575e1c3562749d49b9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/wix?keyword=la+casa+del+sol+salsa+recipe
    • https://cdn-cms.f-static.net/uploads/4488135/normal_6018dec039077.pdf
    • https://nesexabaxurozij.weebly.com/uploads/1/3/4/8/134898102/7718036.pdf
    • https://static.s123-cdn-static.com/uploads/4421365/normal_5fcc3ad1ae143.pdf
    • https://pamuguvijokogag.weebly.com/uploads/1/3/4/8/134883264/nevidasi-bolemuk-puwenebusu-melukoraxagejev.pdf
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/7077563.pdf
    • https://cdn-cms.f-static.net/uploads/4443595/normal_60309d6415c96.pdf
    • https://static.s123-cdn-static.com/uploads/4368471/normal_5fec636999ba4.pdf
    • https://cdn-cms.f-static.net/uploads/4408588/normal_602353ae9f2ab.pdf
    • https://gigufeti.weebly.com/uploads/1/3/4/6/134633464/8815518.pdf
    • https://static.s123-cdn-static.com/uploads/4444378/normal_6006beecc7529.pdf
    • https://cdn-cms.f-static.net/uploads/4381098/normal_60321c3a91558.pdf
    • https://static.s123-cdn-static.com/uploads/4454990/normal_5fe23a2124242.pdf
    • https://cdn-cms.f-static.net/uploads/4417669/normal_5fdc61c639a66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/810795ca-fbda-437c-a806-218f80acec10/69887549308.pdf
    • https://uploads.strikinglycdn.com/files/425c82d1-769e-4eb0-b8b3-6fc33e2f5d82/mixing_and_mastering_tips_and_tricks.pdf
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_25905f6852374b2faa7e25b4029d882b.pdf?index=true
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_c6fceec8709e40a196c87551cff14976.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b12364a8-1903-419f-b731-9dcc415d4bff/what_is_the_5th_tradition_of_aa.pdf
    • https://uploads.strikinglycdn.com/files/2972f505-6462-49ab-8700-1b100719181a/honeywell_rth6350d1000_setup.pdf
    • https://uploads.strikinglycdn.com/files/82276155-3bac-461e-ad9e-e722c747d04e/86101626157.pdf
    • https://uploads.strikinglycdn.com/files/c6e50aa9-395e-4e38-ab2d-c85deb7add76/mowisidekokiroxag.pdf
    • https://uploads.strikinglycdn.com/files/0ca80f09-3274-40c8-93e9-a187c2835e9b/hp_laserjet_pro_400_m401n_toner_office_depot.pdf
    • https://uploads.strikinglycdn.com/files/61c2a70c-727a-47b1-990b-cdca2cb34913/20099504820.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defe.bin
e950f57086fac2831a063286d7760caabe2dd3c7ef4d713047d46d600d3fac0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 5008 bytes
font_01_sfnt_off0000f013.bin
fd7e4c080d7700051cf2742f42882e753d7f59d770bfcda1e2d8eac5f11d5066		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 11176 bytes

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