Malicious PDF — malware analysis report

Static analysis result for SHA-256 c856ce528e8d53e2…

MALICIOUS

PDF

70.1 KB Created: 2020-11-27 12:39:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bf22b8e8fb14c957087a14e23b411a73 SHA-1: 24a2c14e0df0f39d0fdd6dd94414fed242c76467 SHA-256: c856ce528e8d53e2fdc4a8553180bca8ee786eb408ed07dee4965a64066c18f9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://trafficel.ru/123?utm_term=all+about+me+project+ideas+high+school PDF link annotation
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/niporevozimewod.pdfIn PDF document text
    • https://jedarixires.weebly.com/uploads/1/3/0/9/130969076/7014404.pdfIn PDF document text
    • https://bajekilirevi.weebly.com/uploads/1/3/4/8/134868337/474091.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/pulatoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409798/normal_5fbccd1b1a9d0.pdfIn PDF document text
    • https://dumopodowejuna.weebly.com/uploads/1/3/4/5/134591879/zugela.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/a25e922a-ea4d-43d6-9c42-b052c618f2f9/12593650436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf508e4-cf52-4ea2-add9-9d19a10002d2/tisufivinifevez.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/facets_healthcare_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad9f0e2-4d8e-4ecb-af24-66b14c5c782b/the_amazing_spiderman_games_play_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/candy_camera_older_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49306618-ba92-41ba-9fd3-ba273bddbe41/43348919959.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_off0000d53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53A 5692 bytes
SHA-256: aa8e1e0470c5b3cff8284c808ae94a71c14387e2691d8d6ebbc53deb62bcf98c
font_01_sfnt_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 10308 bytes
SHA-256: f6469f3e4399033dcac22dd1d16ff70043f40aaed4aeb7474b820638463416ad

Open this report in the interactive analyzer, or submit your own file for analysis.