Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6db758aead0da33…

MALICIOUS

PDF

82.4 KB Created: 2021-03-20 21:07:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5bee121dec32cefa324dd9584b3dc2f SHA-1: ddc266aefccdbb33f779b8c0578fce57ab3a5848 SHA-256: e6db758aead0da33b05bfee05aa61f3120b36b3485b45b6d9b569724d0b71248
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it is part of a PDF link farm. Numerous external URLs were extracted, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and contains metadata related to PDF generation, but the primary malicious activity appears to be the mass linking to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/123?utm_term=partition+abidjanaise+pdf
    • http://kigumelez.medianewsonline.com/groin_strain_rehabilitation_exercises.pdf
    • https://pobejatu.weebly.com/uploads/1/3/2/7/132741278/5448227.pdf
    • https://goxapuvuf.weebly.com/uploads/1/3/2/7/132741714/6579309.pdf
    • https://vedagerirujo.weebly.com/uploads/1/3/6/0/136055295/nofijisewikona-vofiri-tetojediz.pdf
    • https://zokesafan.weebly.com/uploads/1/3/0/7/130775675/38038a2b30cb673.pdf
    • http://dorulezebum.sportsontheweb.net/71582607502.pdf
    • https://vewewiganivobob.weebly.com/uploads/1/3/4/8/134852084/d9015b99ff0e.pdf
    • https://zitakutuseg.weebly.com/uploads/1/3/5/9/135994262/femekewetafu.pdf
    • https://cdn.sqhk.co/jarixizotib/xhjZhda/video_poker_trainer_wizard_of_odds.pdf
    • https://cdn.sqhk.co/luwagoma/iaqibvA/guida_turistica_cagliari.pdf
    • http://pejokepi.mywebcommunity.org/ledevizazosavatarozunon.pdf
    • https://cdn.sqhk.co/rufomezin/bbntYJw/moneygram_uk_online_chat.pdf
    • http://veviwumifuvemuz.mypressonline.com/how_does_the_book_thinner_end.pdf
    • http://tupaxeguna.scienceontheweb.net/32095356.pdf
    • https://cdn.sqhk.co/xivovido/LdJjei7/callaway_golf_apparel_japan.pdf
    • https://baxiboxizalitif.weebly.com/uploads/1/3/3/9/133987723/beritapuzerajavunoti.pdf
    • https://mexavabawidusa.weebly.com/uploads/1/3/4/3/134375000/rawonekuzab.pdf
    • https://cdn.sqhk.co/nokodexuxof/iejbyRj/nccn_guidelines_for_patients_ovarian_cancer.pdf
    • http://kixurox.getenjoyment.net/lozosipu.pdf
    • http://fijazubelanulek.mywebcommunity.org/clinical_data_interpretation_in_anaesthesia_and_intensive_care.pdf
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/b3a10b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://63209029-b609-4f89-80e5-af59b408cdb4.filesusr.com/ugd/0713e6_38058188611a49bd951a2640628b8bb7.pdf?index=true
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_4b5957778149469ca95e2b4bf93c656a.pdf?index=true
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_70d05e879f6e472a9f8b828377bbeeb5.pdf?index=true
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_1a1a3560378d48f480e66355baf86746.pdf?index=true
    • 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_off0000f8f8.bin
e20e7e815eb1f3bdb480578caa5f41be90109b5d0fea55a5e32189eff75b236e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 5008 bytes
font_01_sfnt_off00010a05.bin
40e2d84d79be79ec20a51ea88cfd7ca125e4dfa0fa287edc77b06409117dd3d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 10432 bytes
font_02_sfnt_off00012dd2.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD2 4324 bytes

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