Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40c28cab1371661…

MALICIOUS

PDF

77.2 KB Created: 2021-03-30 05:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dbd3cadcf9b31c41ed29d7803e800a3 SHA-1: d171246b9d832bdba3a8baca518b87343146589e SHA-256: f40c28cab1371661740ec8a909c71248079890491affeadd720d977cfb8de85b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM'. The document body, though partially garbled, suggests a lure related to educational materials. The presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely to redirect users to potentially harmful sites or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/aws?utm_term=answers+to+human+anatomy+and+physiology+laboratory+manual+second+edition
    • http://secureappeal.com/graco_duetconnect_lx_multi-direction_baby_swing_and_bouncer_reviewsf35yd.pdf
    • https://cdn.sqhk.co/nigulavax/iMjcNdI/kixopisujagejuwo.pdf
    • http://dfwshootersupply.com/54090543218a1jqb.pdf
    • http://raisinshub.pro/savobepevuzagevuxenuj2x2ex.pdf
    • https://cdn.sqhk.co/lojadisexudo/ggijgdf/kijozusalogaxave.pdf
    • http://dnepr24.info/spiderman_mask_template_freec4sum.pdf
    • http://dostafood.xyz/disoxuzedafufimilixu0vr8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tanapilamaxi/appendicular_skeleton_worksheet_revised_9_06.pdf
    • https://s3.amazonaws.com/zuguvoxoki/silupopegefokoguf.pdf
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_57cbb542e352438db7986e70fe12e8f0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/553a146b-a736-456b-a053-aa2e1a5f59f5/how_to_pronounce_common_french_words.pdf
    • https://uploads.strikinglycdn.com/files/d6cc3690-3ee7-4351-99c8-4e76dd8d32f8/unsupervised_data_mining_techniques.pdf
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_25433a8457ac4f8cac26c70ac4109a7e.pdf?index=true
    • https://s3.amazonaws.com/bulozor/pokemon_go_appraisal_app_android.pdf
    • https://uploads.strikinglycdn.com/files/a05e0ee2-9876-4f02-b1d1-e6e47b13280c/xurakux.pdf
    • https://s3.amazonaws.com/setaxilitozuko/free_anydesk_for_windows_7_filehippo.pdf
    • https://uploads.strikinglycdn.com/files/de2061bd-e883-4e0a-be54-d8e475822a7f/what_do_you_feel_when_you_feel_love.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_off0000ee9b.bin
0a3d304e45ec07689d1e523e038381cb377d1047ac786ac4fcce04313c6e8527		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 5808 bytes
font_01_sfnt_off0001024d.bin
23ea5239f4def2ca725afab0ff9d380e5e46f7dd114f3d5e487e64cdc42425a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 10704 bytes

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