Malicious PDF — malware analysis report

Static analysis result for SHA-256 285405e10dc807ab…

MALICIOUS

PDF

73.1 KB Created: 2020-11-19 21:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 24506558dbf8b50859fc6c93da01ec2e SHA-1: b00c5352fe060ab05f3c288ba7caa9e260e79abc SHA-256: 285405e10dc807abb86da4d4960c6d25dceeaae1f90f2c9452be562281147298
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to search terms and application metadata, reinforcing the lure of a search result or informational page. No scripts were extracted, but the presence of numerous external URLs indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=sacramento+to+vegas+train PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f8fbad21a467.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/zediluwi_getepose_tesuponigima.pdfIn PDF document text
    • https://jusujonolixutuw.weebly.com/uploads/1/3/1/3/131379247/5b355f93bd1.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/batike_balabawadusuz_romuw.pdfIn PDF document text
    • https://vakuvovigoder.weebly.com/uploads/1/3/4/4/134467198/12546b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421629/normal_5f9b820cb8bb4.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/59712eab3.pdfIn PDF document text
    • https://wanevowak.weebly.com/uploads/1/3/4/4/134465130/sodafomebifunigijut.pdfIn PDF document text
    • https://wurefosupoz.weebly.com/uploads/1/3/4/4/134493787/704767.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://uploads.strikinglycdn.com/files/ad184c2a-b866-4914-8289-e193668cd8a5/sutimuxogilomiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/532d0445-f7cf-414b-a807-8169b4146368/29338615691.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 5036 bytes
SHA-256: 0179c4292f4287ec4d25b472de3141b68cac33c446137b23a78dae4d0149e32a
font_01_sfnt_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 11056 bytes
SHA-256: 0ee47cf7b5077274522175bb84db6cb4b240e472d1f71e1ce51e4b4de50276e4
font_02_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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