Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44cbb803b01eac8…

MALICIOUS

PDF

87.3 KB Created: 2021-03-16 21:28:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b349792b0004475fdea59cabe2e966fd SHA-1: 289a2695d0c93e7ea88012fd5036041b1d380ce9 SHA-256: d44cbb803b01eac89d7e8df982f7d9bf73c5f4cd27e6c71074d3a179c77bfcee
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external links, with one prominent URL being https://dafemum.ru/wix?keyword=while+guthix+sleeps+guide, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=while+guthix+sleeps+guide
    • http://ruwexidokikisi.22web.org/blackbird_alter_bridge_sheet_music.pdf
    • http://stav-games.ru/442370519374hheu.pdf
    • http://logusubunovad.22web.org/72488513944.pdf
    • http://kusulapezep.iblogger.org/35136643023.pdf
    • http://vibawukukar.iblogger.org/91975060275.pdf
    • http://igclienteam.com/what_is_meant_by_working_memory_in_psychologybl6hk.pdf
    • http://limecash.xyz/definicion_de_exito_profesional_segun_autores1lyo9.pdf
    • http://makeyourself.xyz/45189407853ejrwn.pdf
    • http://gatorama.site/75391653122gywug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_039b6f5f37d14c36a713f8ca3a813339.pdf?index=true
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_d5d0e3d0952c49f0909ee3694e844c76.pdf?index=true
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_a9190c5a3eda4ce289b4c465a46c95aa.pdf?index=true
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_81f77656a21a42d7b2da687ef3f5e421.pdf?index=true
    • http://vamagirizotaro.rf.gd/reformed_theology_assurance_of_salvation.pdf
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_08a9944fd2d14d06a3c27a757b2f6582.pdf?index=true
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_f938f07b6fcd4dd2b598f2ad730d797e.pdf?index=true
    • http://gizugutopaf.epizy.com/brothers_of_peace_songs.pdf
    • http://pitonisude.epizy.com/zegolizobisipo.pdf
    • https://s3.amazonaws.com/xovajukoxin/pexinuvo.pdf
    • http://gubowejuxenixu.rf.gd/nojubolevoxexagusu.pdf
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_48b84ab71400466bb1a0c497b33a637a.pdf?index=true
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_87da476f0dbe44fa9ebbe4d4dca271ce.pdf?index=true
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_81887015a2a547d8b41b25ba1edd3a3b.pdf?index=true
    • https://s3.amazonaws.com/fajetufekejo/73322418865.pdf
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_dd06ec1bdb5345ebb87ea7d21db13e6e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d96.bin
dfee611a6ea9637e43471344474c4d7a7d395c787c0921d43257e12ebcb4b022		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D96 4664 bytes
font_01_sfnt_off00011d94.bin
50a77751d34aac18a40e990882a48f77caca4216a1eced970a0158143931d890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D94 10432 bytes
font_02_sfnt_off00014117.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14117 4324 bytes

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