Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af9d77628f8e7a0…

MALICIOUS

PDF

74.7 KB Created: 2021-04-12 10:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8184665b7e383317166a1421737d2c47 SHA-1: dc07bb25cc9d0861aa8521d46afceb9552612fff SHA-256: 7af9d77628f8e7a0e4d018079d21f9d8e65bb6367804f9ea6d6c3b46efdf44e3
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, as malicious and phishing-related. It contains numerous external links, with one prominent URL leading to a site that appears to be part of a link farm designed to attract traffic. The document body, though heavily obfuscated, suggests a lure related to AutoCAD tutorials, likely to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=autocad+2014+tutorial+for+civil+engineering+pdf
    • https://cdn.sqhk.co/riwifesineji/7gijdjc/country_music_christmas_songs_list.pdf
    • https://cdn.sqhk.co/pibilebomek/gei5gj9/meme_sticker_pack_whatsapp_iphone.pdf
    • https://cdn.sqhk.co/lifudidu/cgcbigL/khloe_kardashian_photoshop.pdf
    • https://cdn.sqhk.co/torujazelome/BZjageU/stickman_dual.pdf
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/2350593.pdf
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdf
    • https://cdn.sqhk.co/noxisoture/gi72Aig/california_medical_board_license_renewal_form.pdf
    • https://lagidipivawe.weebly.com/uploads/1/3/4/3/134347483/6674836.pdf
    • https://cdn.sqhk.co/lipisedopila/NIii4ja/banner_saga_2_chapter_10_walkthrough.pdf
    • https://cdn.sqhk.co/liminekaj/7ehfhjt/siveturo.pdf
    • https://cdn.sqhk.co/rapedipular/2hdxJgV/vudepuwevul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_b42df292751045e68af8ba17d31e135a.pdf?index=true
    • https://s3.amazonaws.com/gonima/68562456396.pdf
    • https://s3.amazonaws.com/jevopemosod/84690772836.pdf
    • https://s3.amazonaws.com/fedure/sidowidutiridegagu.pdf
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_e0bf1cba9c584b54bd24b176379be204.pdf?index=true
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_6618b5cecfd2491d970a82550f2f50a2.pdf?index=true
    • https://s3.amazonaws.com/lerezazo/gubuditunugibikufexe.pdf
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_01d1068c2b0e4907a276db15d15b10c1.pdf?index=true
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_494ec0063d3a45ee85f807ed5962de01.pdf?index=true
    • https://s3.amazonaws.com/tipikaxe/nujakamumurikefesojomi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7bb.bin
292387dc656dec5887b5685182531111510a20b8ec0ad19243a1706264a00311
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 5492 bytes
font_01_sfnt_off0000ea84.bin
5c447aab55984a731bafe11d60957d2759f2eb8ee0be4c33594bf20db1885191
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 10640 bytes
font_02_sfnt_off00010ef7.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 4324 bytes