Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c864bb19f6995cb…

MALICIOUS

PDF

85.9 KB Created: 2021-03-16 06:34:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c475d850f9af9e76f4fc7e971ea5173 SHA-1: dd730058ae001571a12958d6ce987a6a4952c451 SHA-256: 3c864bb19f6995cb34662a91062ba16cc972215093957ef72b80abbcac2d7bb8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=what+to+do+if+you+lose+your+food+stamp+card
    • http://kiwenalod.medianewsonline.com/muzagatadeliwolofaker.pdf
    • https://static.s123-cdn-static.com/uploads/4419630/normal_5fe02d31c797d.pdf
    • http://doxalasi.mywebcommunity.org/gugogitedegovosirisul.pdf
    • https://firunonosud.weebly.com/uploads/1/3/6/0/136052948/330892.pdf
    • https://static.s123-cdn-static.com/uploads/4491433/normal_5fcf880800ea1.pdf
    • https://zasetumodoroba.weebly.com/uploads/1/3/4/6/134692621/gidor.pdf
    • https://rirakivu.weebly.com/uploads/1/3/5/3/135333056/57f464b.pdf
    • http://xogunajeraxuda.mywebcommunity.org/radosupefibifulu.pdf
    • https://cdn-cms.f-static.net/uploads/4448323/normal_602f286ca5520.pdf
    • https://cdn-cms.f-static.net/uploads/4416496/normal_602d1f6ce35fd.pdf
    • https://cdn-cms.f-static.net/uploads/4390681/normal_602f251f83093.pdf
    • http://kavelizopepi.mywebcommunity.org/55378477315.pdf
    • https://cdn-cms.f-static.net/uploads/4465545/normal_5fda2caae91dc.pdf
    • https://febewizonobuwom.weebly.com/uploads/1/3/4/3/134311996/fuvakutupotibuxe.pdf
    • https://cdn-cms.f-static.net/uploads/4467027/normal_5fd63ab33590c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/voxipanovigepiv/guvodokuposinebiluje.pdf
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_ef5daeff0c1849ba81fac1a45ebc4430.pdf?index=true
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_d9c67fe5780b43eb87a381b22aabadc1.pdf?index=true
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_0280468364ad4ceb8aae27f1da7b3bd3.pdf?index=true
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_cacb71e753e4471089f9e7b8da7ec722.pdf?index=true
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_5f57a78a681241a8a98ba48a20bcc039.pdf?index=true
    • https://s3.amazonaws.com/tinezedu/arabian_nights_2000_movie_online_sa_prevodom.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_off00011139.bin
8c7fa8b670cedfc627526b096bb4ee1197d14bf4000f4075e41ace372e1c586b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11139 5508 bytes
font_01_sfnt_off000123e3.bin
d3cb7ad464d45422dd81d39cec403ac3a2aa8eb04eef3c21717bc99d839aa695		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 11244 bytes

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