Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6dba4832787f65…

MALICIOUS

PDF

69.7 KB Created: 2020-12-25 05:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fb9e7e35106d787bcac2df711b950cda SHA-1: 220520b472ef4141acc882784d0f323144b77e66 SHA-256: ac6dba4832787f656e3efdbc7dafbc819d392592283052828a755b4daff7c094
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://traffset.ru/aws?utm_term=informatica+data+quality+user+guide+pdf', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffset.ru/aws?utm_term=informatica+data+quality+user+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5fc2c0b859df6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480735/normal_5fc2c5b22a3e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_5f947f0bd9964.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499021/normal_5fc98bf29e72b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411503/normal_5fcb47f5956c4.pdfIn PDF document text
    • https://gufavugowiguxu.weebly.com/uploads/1/3/4/5/134590320/fegodejabuzenitad.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/389a9f64-4ab2-46a1-917f-dc1a8b60cc1a/75722637261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ec484ad-816a-463e-a940-d1f9865e69b8/bad_time_simulator_sans_fight_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa272ab-adda-4a02-bc21-716c1e980171/vuwanazikiwusufokuxukosil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/524db237-66af-46fe-bee9-1399148f861c/death_knocks_theme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15ade97-4462-4a23-ba24-85f47af30dc3/4liker_apk_latest_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1763a0f-82af-4cb7-8ba4-16b362df5c95/60013575263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f641bd62-ee15-4c83-8681-cb0d05e94f6b/rambo_4_full_movie_123movies.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 5640 bytes
SHA-256: 297c78504e4472ab0e645c2b0981ad9496701a6a8a542d94d6ae462af89ec721
font_01_sfnt_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 10144 bytes
SHA-256: e3003a560d9aac2ac64f5b0693b578168c225185b9533dbafa9459d1ab6e2334

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