Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c336b731acbc194…

MALICIOUS

PDF

80.3 KB Created: 2021-05-26 15:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d09a4b0423dbbac99a520029a036ee0 SHA-1: 95ce898cf04f1e5e8f2854cef8b7870f78a11f6a SHA-256: 2c336b731acbc194452e11b1a1aa390f5781ed5434e331a43ac78803e4cc629b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one pointing to a suspicious domain 'dafemum.ru' that is likely part of a phishing or scam operation. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=how+to+fix+a+hen+broken+leg
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/7d504c.pdf
    • https://mofalapew.weebly.com/uploads/1/3/4/3/134307760/wujosa_xoseluke.pdf
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/45ac51.pdf
    • https://cdn-cms.f-static.net/uploads/4427293/normal_600dcd91116ad.pdf
    • https://pidesetax.weebly.com/uploads/1/3/0/7/130739971/7a57f0f8b5c4d.pdf
    • https://cdn-cms.f-static.net/uploads/4385012/normal_604def6c9e9d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3bcd9d8f-e587-4d0b-98d7-77992b1986c4/64531138289.pdf
    • https://uploads.strikinglycdn.com/files/491c949f-99e5-452d-a840-315ead53e607/98955276496.pdf
    • https://uploads.strikinglycdn.com/files/d09d89d1-085c-487b-8403-e33a0aaafc62/call_of_cthulhu_7th_edition_keeper_rulebook.pdf
    • https://uploads.strikinglycdn.com/files/2b9e8561-533a-4319-b8e9-c5e444e5d4b7/how_to_change_ti_nspire_cx_cas_to_degrees.pdf
    • https://uploads.strikinglycdn.com/files/a1690af9-3730-40db-9f7a-f57239e4e923/farming_simulator_15_ps3_maps.pdf
    • https://uploads.strikinglycdn.com/files/7d567c57-1029-4177-8c92-6ac9598bfb12/how_does_emdr_heal_the_brain.pdf
    • https://uploads.strikinglycdn.com/files/51f314b7-d5f9-436b-b0e0-dbc922183f73/what_are_the_five_rules_for_using_quotation_marks.pdf
    • https://uploads.strikinglycdn.com/files/ec8d8d29-69b1-49c7-8247-0b9dcb6c0e18/what_is_the_latest_whatever_after_book.pdf
    • https://uploads.strikinglycdn.com/files/952ac805-eb95-4ed1-86eb-0c2c9194aa8c/zodigojebepijuki.pdf
    • https://uploads.strikinglycdn.com/files/6f26823f-b477-4b87-a437-0abfbeb7d547/97571180163.pdf
    • https://uploads.strikinglycdn.com/files/59ba178b-ca70-4da3-bfbb-bd01af3d9a9d/64313606396.pdf
    • https://uploads.strikinglycdn.com/files/1ff509c9-04f1-441d-ba38-3b2fd9197313/dean_koontz_devoted_book_club_questions.pdf
    • https://uploads.strikinglycdn.com/files/3495de92-3383-4a8a-a2df-b5a9d5a10ace/how_to_turn_off_garmin_s10_golf_watch.pdf
    • https://uploads.strikinglycdn.com/files/377da852-bf11-4999-8df9-06156d03579d/86668723782.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_off0000fd67.bin
c2f8b188bebf6816b8c7d859e2b9391c0ecc948fea36c72623a313c78a5941ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 5176 bytes
font_01_sfnt_off00010f18.bin
1915658d48ebfc0452fd77bc7e7bb90d28ea9bd2c020a20a83eed8bffde0d9f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F18 10836 bytes