Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b20daf66c21c3a6…

MALICIOUS

PDF

73.8 KB Created: 2021-06-02 21:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4af86a73db1af45d6d357c1d2ccaf69d SHA-1: a7c4b1162907f969e1766debe653d1abb29b7dee SHA-256: 0b20daf66c21c3a68c838b483b45bf18ad96a689c70e98a217acf6d7de5b2275
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing sites, with one prominent URL leading to 'pistant.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. Although no scripts were extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/pbw?utm_term=do+i+have+a+warrant+out+for+my+arrest+in+utah
    • https://static.s123-cdn-static.com/uploads/4424027/normal_5ff8daeabfece.pdf
    • https://static.s123-cdn-static.com/uploads/4478422/normal_5fe2ac24cc80c.pdf
    • https://static.s123-cdn-static.com/uploads/4402721/normal_5fe1f771a95c0.pdf
    • https://static.s123-cdn-static.com/uploads/4371010/normal_5ffff2a3e9ca4.pdf
    • https://vulabomanuxuw.weebly.com/uploads/1/3/4/8/134857085/piludufafupuw-suruvopitezokuj-katipagaled.pdf
    • https://salogisamokowo.weebly.com/uploads/1/3/4/6/134649366/148173.pdf
    • https://cdn-cms.f-static.net/uploads/4497372/normal_60124f312d5de.pdf
    • https://cdn-cms.f-static.net/uploads/4391642/normal_6010a4af50a29.pdf
    • https://cdn-cms.f-static.net/uploads/4461509/normal_605fa3d6128da.pdf
    • https://cdn-cms.f-static.net/uploads/4381291/normal_5fd8b04c48dcd.pdf
    • https://cdn-cms.f-static.net/uploads/4421471/normal_5fd61a0992b1d.pdf
    • https://static.s123-cdn-static.com/uploads/4385876/normal_5fedb8d913f46.pdf
    • https://cdn-cms.f-static.net/uploads/4458618/normal_5fd22e3eddc2b.pdf
    • https://cdn-cms.f-static.net/uploads/4365659/normal_60266a9b5197e.pdf
    • https://puwakama.weebly.com/uploads/1/3/4/4/134474688/dewudeze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fda35212-2844-4786-868d-63abae5ffc15/what_is_psychoanalysis_theory_in_literature.pdf
    • https://uploads.strikinglycdn.com/files/4640cba6-443e-4b1d-8014-73014191ef0e/is_rise_of_the_shield_hero_finished.pdf
    • https://uploads.strikinglycdn.com/files/30634255-45de-4809-8400-338019751b12/ejercicios_de_contabilidad_libro_diario_resueltos_venezuela.pdf
    • https://uploads.strikinglycdn.com/files/26442e76-769d-4092-afcb-0482d20ec72c/aircrack-ng_tutorial_kali_linux.pdf
    • https://uploads.strikinglycdn.com/files/0813b0e0-93e5-4879-b4f1-4b8561eb201b/jagomapotubusaz.pdf
    • https://uploads.strikinglycdn.com/files/543c2ee6-e902-4a77-b52e-019b9d6b77f4/take_the_stairs_free_download.pdf
    • https://uploads.strikinglycdn.com/files/3c99c677-53a0-4973-9ae4-a9a041ed97d6/domijekibokutosiwi.pdf
    • https://uploads.strikinglycdn.com/files/bb76284d-360a-486c-b8f0-bbd2c5724dda/kalibim.pdf
    • https://uploads.strikinglycdn.com/files/5709c780-264e-497c-aef5-81171f30c5a1/where_is_bank_1_catalytic_converter.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_off0000e3e3.bin
3503fbfabaf33fcbeb2af40b4c5ed2f2d9bb9f556bbbdb4493ce6eab453c1d47
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 5228 bytes
font_01_sfnt_off0000f5a0.bin
1a0f2c4b7485a1966b9f1ea3722564b4ce66ef2d06b76d562e32d45f83a37fe0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 10492 bytes