Malicious PDF — malware analysis report

Static analysis result for SHA-256 a159ec556941b31c…

MALICIOUS

PDF

76.6 KB Created: 2021-03-17 03:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c88ee5be1c99de439ee039b4ec4bd6d SHA-1: e89f2f6f33e80339b712bc388776e57b5648a1b8 SHA-256: a159ec556941b31c2fccfb54ed16e91877e13dc2282a84516e4bedcfdf18d115
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous external URIs, with a primary focus on directing users to potentially malicious or phishing-related content. The document's structure and the presence of multiple external links suggest an attempt to lure users to external sites, likely for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=bsc+physics+2st+semester+question+papers+pdf
    • https://geridaradekod.weebly.com/uploads/1/3/1/4/131437552/8796a20e5.pdf
    • https://cdn-cms.f-static.net/uploads/4426971/normal_6041040325fb2.pdf
    • https://cdn.sqhk.co/zimuteraf/jPICieP/lodof.pdf
    • https://cdn-cms.f-static.net/uploads/4451736/normal_6020996abaeb5.pdf
    • https://mubuvume.weebly.com/uploads/1/3/4/8/134885019/5af017b8.pdf
    • https://cdn.sqhk.co/govamopega/jhfgcge/zeweminuro.pdf
    • https://xanixozejalupu.weebly.com/uploads/1/3/4/8/134873627/gufesewefobo_segefulefu_faduzep_tudijapekexeji.pdf
    • https://cdn.sqhk.co/dulinifijal/ajgZPii/wolo_air_horn_sounds.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2af9db44-4488-4b4f-8db7-d0db5a09eecb/denotovidojakuwozidemeka.pdf
    • https://298c7861-702e-4dad-8e6b-798164301c36.filesusr.com/ugd/98adb1_cb95a6660df944eea188be845edcb82a.pdf?index=true
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_dfea96084c6c45fbb3b940b339aee6df.pdf?index=true
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_20406ee6f5e740e58a226309c13f0e4e.pdf?index=true
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_9f1d9d149f5343d194a61089d34a86e8.pdf?index=true
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_9efbdf765fc546faa02db9892fa26f88.pdf?index=true
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_f531120bca4d4e919b281abe06788651.pdf?index=true
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_4605f76fc9b94922aaec637d4efaf3d4.pdf?index=true
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_bd656a494d2242f6be8e766f07633181.pdf?index=true
    • https://uploads.strikinglycdn.com/files/99677ad3-aa92-41d0-bbcc-744385ad8c56/85522412992.pdf
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_1226071bb92141329c4e307f3d478824.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_off0000eb57.bin
76d849f3f44dd922cb227e48b2540dff0187d28824001c3ca80bb059e848d132		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 5772 bytes
font_01_sfnt_off0000fedc.bin
b21be4cacc7af836c3f04457b8601eda0e01ac13bb445ac3bc3294853862969a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 10776 bytes

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