Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5398cbf1d27825…

MALICIOUS

PDF

76.1 KB Created: 2021-03-05 10:10:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a0788de0b20a6ce35c02b8cba8d7b2f SHA-1: 7fe6eff002414f6b6eb324573feea0da855da8dc SHA-256: 8f5398cbf1d278252db70a146d62420066c339e98388ec76056dc540b20ba777
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 link pointing to a suspicious domain (`midufefew.ru`) that is likely used for phishing or malware distribution. The heuristic `PDF_SEO_LINK_FARM` indicates a large number of external links, suggesting an attempt to generate traffic or distribute content. ClamAV detection and ML classification further support the malicious nature of the file, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/wix?keyword=crosley+manual+vinyl
    • https://bumokodujexub.weebly.com/uploads/1/3/4/5/134595190/bevodukolujamefit.pdf
    • https://tunorikiwevog.weebly.com/uploads/1/3/4/0/134097136/09f4c67b.pdf
    • https://domafotenok.weebly.com/uploads/1/3/5/9/135973376/giladipenoj.pdf
    • https://vuxojamobepu.weebly.com/uploads/1/3/4/3/134333522/fazuwodomusira-dubiduseji-lirozelubupepa.pdf
    • https://sovonasu.weebly.com/uploads/1/3/1/4/131407222/zenodaw.pdf
    • https://tipipiteker.weebly.com/uploads/1/3/0/7/130775441/c621088a3.pdf
    • https://nedovewa.weebly.com/uploads/1/3/5/3/135316636/4033610.pdf
    • https://mejatuwunuzawe.weebly.com/uploads/1/3/0/7/130775850/mowar-wugamagesala.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jeponowon/89231347811.pdf
    • https://s3.amazonaws.com/fuzafuzeruwit/sirisideleporapudadir.pdf
    • https://s3.amazonaws.com/setigafat/blogspot_templates_free_html.pdf
    • https://s3.amazonaws.com/kuxegu/48045513373.pdf
    • https://s3.amazonaws.com/bezutu/74807401752.pdf
    • https://s3.amazonaws.com/firudegix/akbar_saleem_anarkali_telugu_movie_songs.pdf
    • https://s3.amazonaws.com/nelizenejakarug/sony_wega_trinitron_tv_remote.pdf
    • https://s3.amazonaws.com/tixedujegibex/autocad_2007_win_10_64_bit.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/ffxiv_world_of_darkness_gear_sets.pdf
    • https://s3.amazonaws.com/farowug/kindergarten_report_card_comments_for_parents.pdf
    • https://s3.amazonaws.com/jujojomojemiz/sarotu.pdf
    • https://s3.amazonaws.com/luxaduzimase/lejix.pdf
    • https://s3.amazonaws.com/buwosevax/ps3_bruteforce_save_data_3._8.pdf
    • https://s3.amazonaws.com/dejolavubukugeb/at_t_company_profile.pdf
    • https://s3.amazonaws.com/fewunadupop/bcbs_prior_auth_form_texas.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_off0000ed9a.bin
98d4d6b7feb04a2b41af36e60fc7a5f618db95de95ad8fdae80f755b3c751ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 4900 bytes
font_01_sfnt_off0000fe2e.bin
8890f2882805402a1c9ca2db729c98e67a2937d0569f15bd69ed3ac549181cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 10892 bytes

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