Malicious PDF — malware analysis report

Static analysis result for SHA-256 4920fa7dbe770893…

MALICIOUS

PDF

68.2 KB Created: 2021-04-07 07:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98bc3f49c32f6507a95d9a0f229671c6 SHA-1: 44bf1ba1ba5191956404ec898d21f054606f2b17 SHA-256: 4920fa7dbe770893f7a345d64982bc686a6251b7682a97cf7bb5fa5a0e8d34ea
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

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-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://resalured.ru/wix?keyword=exponential+growth+and+decay+functions+worksheet
    • http://silujokiz.mypressonline.com/awesome_oscillator_strategy.pdf
    • http://reduslimitalia-ufficiale.site/achievement_test_examples6u2rm.pdf
    • http://pivolirarorip.mypressonline.com/tubomesutinixopif.pdf
    • https://bewodopogogubak.weebly.com/uploads/1/3/4/8/134886142/koputusomekoduzi.pdf
    • http://roboludawu.mywebcommunity.org/nefixapekijetikiditedarig.pdf
    • http://fruitslope.online/41909079402wj9jb.pdf
    • http://vimabanu.sportsontheweb.net/30066693718.pdf
    • https://dirivabekere.weebly.com/uploads/1/3/3/9/133999762/e0ebc5e23508.pdf
    • http://xepewifub.mygamesonline.org/pmp_application_form_sample.pdf
    • http://kowuterada.mygamesonline.org/56074586984.pdf
    • http://vixabaj.scienceontheweb.net/atlas_of_veterinary_pathology.pdf
    • http://robugipunebib.mygamesonline.org/sanenetinijit.pdf
    • https://raxuremaxu.weebly.com/uploads/1/3/5/3/135350699/eaa953d9faa1.pdf
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/4241192.pdf
    • http://fekevopimibun.sportsontheweb.net/90357556319.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gelawiweza/dark_souls_2_differences_between_scholar_of_the_first_sin.pdf
    • https://s3.amazonaws.com/lebejos/43928980795.pdf
    • http://reladefuxuna.onlinewebshop.net/cuddle_buddy_application_form.pdf
    • https://s3.amazonaws.com/jowutoneranemuk/93289833475.pdf
    • https://s3.amazonaws.com/vufuzewasi/how_to_log_into_chrome.pdf
    • https://s3.amazonaws.com/filidabut/romozadakegoxemuxitit.pdf
    • https://s3.amazonaws.com/bokelur/best_guitar_tabs_for_beginners.pdf
    • https://s3.amazonaws.com/legipalofi/brick_breaker_game_report.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_off0000ca36.bin
4bf1e2a1a3c9e51b98525975138d4f39e91c3bce4f1b5776bdf3801933787b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA36 5700 bytes
font_01_sfnt_off0000ddc2.bin
814d9645442e09bf0388f0bed579aaf86ef3b8bdf863a3f84a2dee9be5ba312b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 10384 bytes

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