Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da8c1a4b6df6563…

MALICIOUS

PDF

80.2 KB Created: 2021-06-10 17:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75118fe51847c2317ca036105cde6588 SHA-1: e760f0d3e5abc3f9f1c7e04a9f95569b2957f4ec SHA-256: 6da8c1a4b6df65631c5a44a1984137ac570ee16fe45a355e23f2bcd5d5d3af98
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to 'garglob.ru', which is flagged as unknown reputation. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via these links.

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-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://garglob.ru/pbw?utm_term=car+racing+offline+games+2020
    • https://cdn-cms.f-static.net/uploads/4448103/normal_601433d7b631f.pdf
    • https://duvirimak.weebly.com/uploads/1/3/4/6/134603536/xinomafo.pdf
    • https://cdn-cms.f-static.net/uploads/4480149/normal_5fd1e6efdca83.pdf
    • https://cdn-cms.f-static.net/uploads/4462096/normal_605444ffce364.pdf
    • https://lotetirupaxep.weebly.com/uploads/1/3/4/0/134013035/lapigiwepatosovufi.pdf
    • https://mumoporexebaxuz.weebly.com/uploads/1/3/4/3/134339912/9246230.pdf
    • https://cdn-cms.f-static.net/uploads/4443344/normal_603ed4f21202b.pdf
    • https://riwoxevasesu.weebly.com/uploads/1/3/4/3/134327075/xejepawaguvuvika.pdf
    • https://daxakowov.weebly.com/uploads/1/3/4/7/134704390/e921d7fc7.pdf
    • https://balemimuw.weebly.com/uploads/1/3/4/8/134882120/ed79a106f3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6ad3c769-c3d3-4af0-849b-5b60c8ee16cb/jeep_grand_cherokee_srt8_2008_specs.pdf
    • https://uploads.strikinglycdn.com/files/83118a74-430d-4aa4-9fbf-bbf24aad7344/clinical_investigator_brochure_template_medical_device.pdf
    • https://uploads.strikinglycdn.com/files/347b1fbc-a74b-45b2-af5d-1bc2419d55b7/what_were_the_major_patterns_of_native_american_life.pdf
    • https://uploads.strikinglycdn.com/files/3a962dd0-dcbc-4cd6-bede-ae69b40ef640/jozos.pdf
    • http://nipekari.pbworks.com/f/53141053738.pdf
    • https://uploads.strikinglycdn.com/files/ebb52694-5958-476b-bd7e-4b70731a3bc7/zajajowugafanitigisi.pdf
    • http://nagaxop.pbworks.com/f/37639550266.pdf
    • https://uploads.strikinglycdn.com/files/e4864651-209a-40b8-aae3-d6e7072e679d/95787040029.pdf
    • https://uploads.strikinglycdn.com/files/36ba32aa-342e-4341-8624-129f814d8b12/how_to_code_java_on_chromebook.pdf
    • https://uploads.strikinglycdn.com/files/fe27144c-f890-445c-aab0-e291a422c160/wovovujezojawepuwuvamu.pdf
    • http://palejemevat.pbworks.com/w/file/fetch/144587403/is_the_facebook_blueprint_exam_hard.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_off0000fb1e.bin
87d73711099cb3a75eb1c0796c6123e3ee79ab1f484f06a1bbd88618eb75d2ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 5380 bytes
font_01_sfnt_off00010d57.bin
83caa6a33acb5791d642bbd21c1c4daeaa5482ee1d0762d2632133a9bcef16bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 10804 bytes