Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b794dc738a57ab0…

MALICIOUS

PDF

95.3 KB Created: 2021-03-05 03:48:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7032d086d43da7610f911c858ec644d9 SHA-1: f587d280973f2a685d544d7b1f81e2d206979336 SHA-256: 9b794dc738a57ab0d79b66c8c7c0fd5883c4f4795628205eb726e1ffe1bbd200
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/strik?utm_term=graph+data+structure+program+in+java PDF link annotation
    • http://telemprom.xyz/manuale_digitale_cd_press_clasa_7l7tg7.pdfIn PDF document text
    • http://nnorm-id.com/puparisaxicoy.pdfIn PDF document text
    • http://familyit.info/warship_craft_hack_ios_downloadgyh3m.pdfIn PDF document text
    • https://kikuwigew.weebly.com/uploads/1/3/1/4/131407235/bad9c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461523/normal_603c8305b2f15.pdfIn PDF document text
    • http://limaxinsto.xyz/les_pronoms_relatifs_qui_que_o_dont_exercicesibhjd.pdfIn PDF document text
    • http://kernig.online/cisco_sg300-10sfp_10-port_gigabit_managed_sfp_switchct3e5.pdfIn PDF document text
    • https://welerenumabo.weebly.com/uploads/1/3/4/4/134467224/78be7e5.pdfIn PDF document text
    • http://pl50off.info/juripiwitipotevalujizakusd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_602d75e684c0f.pdfIn PDF document text
    • http://5coupons.info/how_to_read_forex_fundamental_analysism6k1e.pdfIn PDF document text
    • http://bio-ita.fun/47041124108fej1c.pdfIn PDF document text
    • http://kengoru.space/125387241069gc69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_6027759941935.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2961bf8b-4e1f-4652-9e38-d63c389ca4cf/how_to_install_ecg_on_apple_watch_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29fefb41-1a60-4cd1-9deb-dd865df8f1d6/28830028604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f14c15ab-d750-4c85-9810-3acbdd52ac6f/38771278502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35654747-bd4c-4dd4-b7b7-f39069e3d39e/23472993357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a9aa106-bbd4-4998-a0fe-808aaa789419/pioneer_vsx-1124-k_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e1f72c8-27fe-418c-b03d-fd4bff45ad5d/self_portrait_drawing_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9b34fe-49ab-49bc-8c32-550a511d3229/ocr_a_level_biology_specification_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de6a3d42-985d-44f5-9409-9c1664599922/replace_drum_brother_2270dw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 5620 bytes
SHA-256: 84574d8d8cf4f10818a4759a0b2d502faa54a6e3ddd502b7347561b23a09b2d9
font_01_sfnt_off000130ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AD 12644 bytes
SHA-256: 4cee6480d4298de2bbbc0315be6f964e94150ce11b452acb12ef2aa181131bca
font_02_sfnt_off000159f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F5 16236 bytes
SHA-256: 10dfb5eec316a0894468f97f91df0ac3e9a471c42381e65024e6cba26b90b75a