Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c912c2b332e170…

MALICIOUS

PDF

80.8 KB Created: 2021-03-09 17:02:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f72d17075cd3bcee63538973678a372 SHA-1: 4652886cadd9456d2bb7fda35189710bd011ea3a SHA-256: 52c912c2b332e170b77b37edcf316abe344bdea9f84ad93ef643e95b69947161
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, characteristic of a link farm or SEO spam campaign, with one URL pointing to a potentially malicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of embedded URLs and the heuristic firings strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bologen.ru/award?keyword=structure+of+bacterial+cell+wall+pdf
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/luzotigedamuler.pdf
    • https://cdn-cms.f-static.net/uploads/4466662/normal_6011366c426c1.pdf
    • https://static.s123-cdn-static.com/uploads/4408188/normal_5ff31bcde0897.pdf
    • https://cdn-cms.f-static.net/uploads/4449605/normal_5fe6a0515438a.pdf
    • https://cdn-cms.f-static.net/uploads/4459029/normal_6031499fd4cef.pdf
    • https://wizisenax.weebly.com/uploads/1/3/4/3/134320615/7939973.pdf
    • https://fikifiwokadekaw.weebly.com/uploads/1/3/4/5/134585034/756161.pdf
    • https://cdn-cms.f-static.net/uploads/4485157/normal_5fd3226a65275.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fb79b684-d8a5-427c-953c-8403e1661677/neduxawofo.pdf
    • https://uploads.strikinglycdn.com/files/435f9a16-f1cb-4c9f-a60d-79da570b68dc/ge_indoor_timers.pdf
    • https://uploads.strikinglycdn.com/files/bb1bd12a-1728-4688-944b-1aaa8be0b3f8/hamilton_beach_toaster_oven_31144_manual.pdf
    • https://uploads.strikinglycdn.com/files/c1c0e692-d673-47d4-acc7-944e516f822c/94817034400.pdf
    • https://s3.amazonaws.com/xoxaneral/seloju.pdf
    • https://uploads.strikinglycdn.com/files/c2bf72cc-ca8a-430a-9c9e-d9457175272e/what_is_incapacitation_in_law.pdf
    • https://uploads.strikinglycdn.com/files/0802fcaa-43ed-48b7-a779-cddf7f04a1e1/mipezefap.pdf
    • https://s3.amazonaws.com/neviwove/best_paid_games_android.pdf
    • https://s3.amazonaws.com/wegemebufojafak/resumen_de_los_capitulos_de_la_familia_de_pascual_duarte.pdf
    • https://uploads.strikinglycdn.com/files/1aacd688-7429-47bf-9881-8f20ddaff564/siwixekukizofabuvobude.pdf
    • https://uploads.strikinglycdn.com/files/6e3bfd44-9cfd-44e7-8882-eea610177a10/26112739664.pdf
    • https://uploads.strikinglycdn.com/files/7d1d0f07-09cb-40c2-8864-aa70cca4a2cd/heroes_of_olympus_book_2_weebly.pdf
    • https://s3.amazonaws.com/buxoparadazegu/makalah_bandung_lautan_api.pdf
    • https://uploads.strikinglycdn.com/files/03cacfaa-2217-4a05-80d6-c8810e52e4fa/lowrance_elite_5_chirp_installation_manual.pdf
    • https://s3.amazonaws.com/kofabube/86872233558.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_off0001002b.bin
430676b22f61ae3a99fea41f5cfa0775161e26d0a0ece3464061e1f959697f78
pdf-font-stream PDF embedded font (sfnt) at offset 0x1002B 5304 bytes
font_01_sfnt_off00011256.bin
e2009fa900de3199df6f5ef17fc5ea0c0a90b34d0b9eef946b503c0826e45954
pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 10276 bytes