Malicious PDF — malware analysis report

Static analysis result for SHA-256 041731d4f1556bc5…

MALICIOUS

PDF

78.5 KB Created: 2021-04-06 02:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2e30b4b5314ee3802395e507764526d0 SHA-1: e25c0c1f1b116691f86b8727bbafdeb1734bd9d2 SHA-256: 041731d4f1556bc5683f83facf69ba283ddc590af93235a5af5f19e6239ff921
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically pointing to a suspicious domain ('gimoguvi.ru') that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://gimoguvi.ru/award?keyword=shapes+and+their+names+pdf PDF link annotation
    • https://cdn.sqhk.co/vibisidumes/ajajghc/dessert_recipes_with_cream_cheese_and_peanut_butter.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/3795446261kd305.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/SDigYhc/jakoratunadi.pdfIn PDF document text
    • http://perfectiona.online/independent_clause_vs_dependent_clause_worksheetxnd9e.pdfIn PDF document text
    • http://dommasters.site/wesusitolilixepokodesirosc6c6k.pdfIn PDF document text
    • http://persequen.com/virtual_dj_mixer_2019rnqvm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373508/normal_605d744b2cf99.pdfIn PDF document text
    • http://euroshopme.site/nesofajo9bsk1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_6047f1139697a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417997/normal_5fff0198105c4.pdfIn PDF document text
    • http://electriccannoz.club/hp_4700_printer_release_daterq79e.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/how_to_share_a_word_document_on_fbihowo.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/OsXghgh/crazy_games_plants_vs_zombies_2.pdfIn PDF document text
    • http://samettemiz.xyz/17329849587zcehl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fixararololu/b._el._ed_answer_key_2018_du.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_bf55eaffe91b4185badf9586c4c5b690.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojaxub/daihatsu_charade_1992_manual.pdfIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_014da6af33c146a0a8d9039d98198d5c.pdf?index=trueIn PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_43b46df97be847fa97b070e4d13438f2.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 5028 bytes
SHA-256: f04b6c4d2a1cf4047d9ba4a1e4a3918e2f2dfff05b90088e1439fc5c5246ce7e
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 11052 bytes
SHA-256: 69583af303b1f85de49633f1dc8e7e25fe16b9afd77fe3329291948fbfd23122
font_02_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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