Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cf6691e34b87c5…

MALICIOUS

PDF

76.1 KB Created: 2021-03-23 22:03:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a68ab856abac422d6b748e16875f5cd SHA-1: 7d2dc79cf76627fb2675a627a4e6d824323d8a2d SHA-256: b7cf6691e34b87c58feddb58733676b8ca513ad861cacd5a1af47426e4d910e9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While the document body is heavily corrupted, the presence of many external links suggests a link farm or redirection mechanism designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jumiwimov.ru/strik?utm_term=area+and+perimeter+worksheets+5th+grade+pdf
    • http://vaxisezawoged.scienceontheweb.net/novewipogam.pdf
    • https://semovililuf.weebly.com/uploads/1/3/4/4/134476677/f01a59c0f.pdf
    • http://patajafurep.mywebcommunity.org/3614002074.pdf
    • https://bilewemebit.weebly.com/uploads/1/3/5/9/135964156/8d82dc66.pdf
    • https://talonira.weebly.com/uploads/1/3/4/8/134895983/fd6ea33b16d3.pdf
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/bea66686e05c6.pdf
    • https://tugesarafexo.weebly.com/uploads/1/3/5/3/135319839/a252d676.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_3de1bc579181493e81a051e815b39413.pdf?index=true
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_1ea84b5742c443e5bff9f38a0f30f8f2.pdf?index=true
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_ba5bb70037114a4489e5ce7b74ec14e7.pdf?index=true
    • https://s3.amazonaws.com/toguvaju/mack_e7_460_specs.pdf
    • https://s3.amazonaws.com/gapivegek/77319557409.pdf
    • https://s3.amazonaws.com/zomuzigo/5236543609.pdf
    • https://s3.amazonaws.com/xokebore/beninun.pdf
    • https://s3.amazonaws.com/joterige/93184472285.pdf
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_3688afaba31f416fb6fddb20e8e3d91a.pdf?index=true
    • https://s3.amazonaws.com/purixifusipelid/yowhatsapp_anti_ban_app.pdf
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_c1a574a703b64d148262ce2bc85ef620.pdf?index=true
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_11a8be8764e345ca831d4fcd8d522fac.pdf?index=true
    • https://s3.amazonaws.com/kosipefojaw/characteristics_of_personality_disorders.pdf
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_324452fb7aa046af808d5c7a5d2091d2.pdf?index=true
    • https://s3.amazonaws.com/zinudipir/offline_strategy_games_for_android_apkpure.pdf
    • https://s3.amazonaws.com/pajeriramal/golden_slumbers_sheet_music_free.pdf
    • https://s3.amazonaws.com/dotivaf/boy_hairstyle_image_2018.pdf
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_ff2b7285ae4b469ca95527630b1db52d.pdf?index=true
    • https://3d9856c9-ddaf-40ef-ab37-14107f3d3ee7.filesusr.com/ugd/938106_b5a9d370242644339bd72680b93a5832.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_off0000e9a8.bin
2c793f17cc50c05c4ce9c8f0f28a8a277c7339d38f3943d539e6a8601b49e9cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 5692 bytes
font_01_sfnt_off0000fcfd.bin
51b5d1fa329d590d741fde6267ca3ac5107d9fd92aec02b94f7be478a7690c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 10760 bytes

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