Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b2a9a7a2d91723…

MALICIOUS

PDF

79.6 KB Created: 2021-03-25 01:32:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c2a77b75e90f0fad9389d75886d4f73 SHA-1: d372d5f663b333efa2e8b9fd52ddedb16925b5f1 SHA-256: 02b2a9a7a2d91723be31f4b25f39d7f80d9828c7770ac61d902b527c0b82dec1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on dynamic DNS services or free hosting platforms, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these external URLs. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=pecha+kucha+style+powerpoint+presentation
    • https://vakofariz.weebly.com/uploads/1/3/1/4/131438137/4764205.pdf
    • https://cdn.sqhk.co/fetumamuv/YqSiijf/97531884557.pdf
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/f1916.pdf
    • http://reduslimer.website/5105998799eygx.pdf
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdf
    • https://muberelikaxisax.weebly.com/uploads/1/3/1/1/131163953/goxar.pdf
    • https://tujilebofali.weebly.com/uploads/1/3/5/3/135398949/jiruge-xesefigogol.pdf
    • https://cdn.sqhk.co/nubalevuvem/iEwzs8y/bstc_allotment_letter.pdf
    • http://idealica-italiaoficial.site/vebanivexafonptfti.pdf
    • https://tavulejitozusol.weebly.com/uploads/1/3/0/8/130873759/6431821.pdf
    • http://vijepuwobewi.mygamesonline.org/telovamovobu.pdf
    • https://kusezobovezuzeg.weebly.com/uploads/1/3/4/6/134689385/sonimoxijaf.pdf
    • http://lnstagram-helping.live/zudizoxefewogapibuvogj5jj4.pdf
    • https://cdn.sqhk.co/feluxolid/hiabDhh/dialysis_near_memphis_tn.pdf
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/8201375.pdf
    • http://vazawujuzu.sportsontheweb.net/muscle_growth_workout.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/252d81d1-af78-466a-ad81-6415b98e2f08/lost_my_sentry_safe_factory_code.pdf
    • http://zowofiz.myartsonline.com/what_were_the_three_colonial_regions_in_early_america.pdf
    • https://uploads.strikinglycdn.com/files/61fdc424-fb5f-4d6a-8a75-2b05f9772f45/83836486488.pdf
    • https://uploads.strikinglycdn.com/files/4829e39b-2475-40ba-be23-5a05d8223c5a/tone_it_up_recipes_protein_balls.pdf
    • https://uploads.strikinglycdn.com/files/8abc3570-7d1c-4982-8c9e-fbbebecb06ba/sufabifelanatoxe.pdf
    • https://uploads.strikinglycdn.com/files/7158cad6-9d81-4746-a56d-89d7353ac41d/tisuwenuzu.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_off0000f930.bin
77d841127a9a26638722c29e68b8aabe0c64fc8012a4f8ae0290d6b9c4d6fbfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 5280 bytes
font_01_sfnt_off00010b35.bin
a7be7792dd365873e3ad78550046c4b98f9dfd707f6d42ea649e03eec3ddf647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 11000 bytes

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