Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19c358f4cf8d6ce…

MALICIOUS

PDF

67.5 KB Created: 2020-11-25 20:35:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e274baeacb84a3c030f3e4c62932c7df SHA-1: 96f160e6ac13c160cc1c409005c23cfee1e98f13 SHA-256: b19c358f4cf8d6ceb1f565b5da119bf3230133060e974570e8a9accb7fa3ca33
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a mass external link farm, with numerous links pointing to disposable hosting services. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a strong likelihood of this document being used for SEO manipulation or to redirect users to malicious content. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/aws?utm_term=staff+engagement+strategy+template PDF link annotation
    • https://fizozedodid.weebly.com/uploads/1/3/4/4/134484686/8af1c6c685d.pdfIn PDF document text
    • https://wajupera.weebly.com/uploads/1/3/4/7/134763514/1486f03f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_5f986ffa31f18.pdfIn PDF document text
    • https://gimepofu.weebly.com/uploads/1/3/4/3/134365645/xobexonuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5f88def972d0b.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/vodaxanilixezal_sosokubewexuzup_xesiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469358/normal_5faf0fec79417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415936/normal_5f96ff41b39ad.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/8775898968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490534/normal_5fbb3ea0b83f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/31159299338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b51747d-2cab-42e4-850e-91df816eddd9/netuvanuzevelagolefimep.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/integrated_chinese_part_1_level_2.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_off0000cbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCF 5424 bytes
SHA-256: 13331d6a90ebc6d0718fa37ce07cfaa5465967e8752ebfe2d3246129809c96e0
font_01_sfnt_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 10240 bytes
SHA-256: c056ac826c7b49dacd0d9a3ddedd202405b296a0425ead71d55b76e45c461637

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