Malicious PDF — malware analysis report

Static analysis result for SHA-256 2529613205e7b8f0…

MALICIOUS

PDF

143.4 KB Created: 2020-11-25 21:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: be2cf42424fb1ba206401fc43b1f8f7e SHA-1: bb3af0bf7e8b00d7d472e9bf8dff8721d687d2a8 SHA-256: 2529613205e7b8f0cbe4495e44a5b924387d13e9cb6f9020fd6e15864ba32798
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, including one pointing to 'trafficel.ru', suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title that appears to be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/123?utm_term=worm+that+walks+miniature PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5fa45513d4930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404524/normal_5fb714976a2dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5fa38c71539d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420441/normal_5f9727a040e2c.pdfIn PDF document text
    • https://werijininen.weebly.com/uploads/1/3/4/6/134635560/mogakewuzovakiduvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446260/normal_5fbaba0f4ee07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f871292d5f03.pdfIn PDF document text
    • https://gozajajemitala.weebly.com/uploads/1/3/4/3/134325553/4409549.pdfIn PDF document text
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/jovemenek.pdfIn PDF document text
    • https://loxekezipoga.weebly.com/uploads/1/3/4/6/134678149/xifisaki-notafe-wizedebudi.pdfIn PDF document text
    • https://bijivabaj.weebly.com/uploads/1/3/4/6/134601785/giboride.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425784/normal_5fa5c7ec297bc.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/lokakipifuzaba.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/81a7e694-232a-48cb-8a64-7dad7d7baacf/98986789560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0304851e-5b43-45b1-b419-5ce06ba194ef/shiver_junji_ito_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ba3723-4558-40d5-bb32-6d19c4200f50/99033021679.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_off0001ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA5D 4976 bytes
SHA-256: 3c7fe26685460f553d51d15406ba21c596ada437f8dd6fcfdf82ac1ef51d361b
font_01_sfnt_off0001fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB30 11384 bytes
SHA-256: ed6ba644278523586320403cafbc1d430e68071c1a3147449b9ef07d253bfd16
font_02_sfnt_off000221a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x221A1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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