Malicious PDF — malware analysis report

Static analysis result for SHA-256 852fd456235b25b3…

MALICIOUS

PDF

49.3 KB Created: 2020-11-06 16:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0fb1aa97e2fa67fa5071313cf912e77b SHA-1: d29825ae7446d46e5b4a3bf1ee65f9cf4f2ac343 SHA-256: 852fd456235b25b34f98bae7a7f295fff61a78492c42897cf144641177f13f0b
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating it hosts numerous external links. One prominent URL, 'https://traffking.ru/123?keyword=the+causes+of+the+great+depression+apush', is embedded within the document body, disguised as information about the great depression. This suggests a social engineering tactic to drive traffic to potentially malicious sites. While no scripts were extracted, the ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffking.ru/123?keyword=the+causes+of+the+great+depression+apush PDF link annotation
    • https://gobisenuginofaz.weebly.com/uploads/1/3/4/4/134490447/xewuwa.pdfIn PDF document text
    • https://panirosarukiza.weebly.com/uploads/1/3/4/1/134132539/nisozepizuju-gikagux-xejesageguf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/subud/6106005053.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/clover_hill_library_midlothian_va.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/lodebukiworidu.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/28843084689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/786550d5-295c-459f-94bf-f93b901bab0f/wwe_2k14_ppsspp_android_download_highly_compressed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6131809c-b207-4ab5-a660-3894af55bf3d/26156310100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e05ce4e7-8f83-47dd-8a64-adba2b3f4428/krups_savoy_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/47391076400.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/98730659620.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/tivufulinelabuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/port_authority_bus_terminal_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48922c3a-d125-4e43-90f7-77e8bd1402d6/bufusifugijukunudezomak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e7c3a4d-3875-4f6d-baeb-3e8adca8e1ea/votilegebedivezike.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75BC 5216 bytes
SHA-256: 342aee289641bbb458d9488e240f2366dfe4383374d5febf70f979d80634d53c
font_01_sfnt_off00008773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8773 9928 bytes
SHA-256: 6570201014dc13474096938e77a2b3dcf75bd84317ce8d93be13af47d85a37e8
font_02_sfnt_off0000a97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA97F 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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