Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5778f1fdeab38a…

MALICIOUS

PDF

67.8 KB Created: 2020-12-18 14:48:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50e2548507b6ffa47c1aa72ee60f509c SHA-1: d482fb527eccf38c23c0126fa2b0f44549d286b6 SHA-256: 2b5778f1fdeab38aa95ce243b45d4bdaf101a834f178670adc920ca1d5dceb37
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URLs suggest an attempt to redirect users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=netis+wf2120+driver+windows+xp
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/xazekizijaliva.pdf
    • https://cdn-cms.f-static.net/uploads/4368493/normal_5f8e8d15a7ebf.pdf
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/pumivunexogifinoves.pdf
    • https://vidulegu.weebly.com/uploads/1/3/4/8/134897898/2dd82ea9617c5.pdf
    • https://lopinelu.weebly.com/uploads/1/3/4/3/134369173/fodafakeko.pdf
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/nerodurelunexufi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/79f232f7-256e-48b4-905b-1070695ccbbd/parent_teacher_conference_forms_preschool.pdf
    • https://uploads.strikinglycdn.com/files/5b99c43d-e2e3-470a-a62a-1d9565cc16b9/805471518.pdf
    • https://s3.amazonaws.com/kikunojulejuj/saripegap.pdf
    • https://uploads.strikinglycdn.com/files/1d4c569f-18b5-46f4-8cf9-e0f5a9fc710e/barapalunogafenowinuv.pdf
    • https://s3.amazonaws.com/woxewiwupir/ehrc_report_labour.pdf
    • https://uploads.strikinglycdn.com/files/832abd15-7c70-4878-9247-f147aaeed387/absolute_value_equations_and_inequalities_answers.pdf
    • https://static1.squarespace.com/static/5fc67f9ce5c7695ca9c21019/t/5fcf5328798354522d0d7e1f/1607422762535/banasalajufeza.pdf
    • https://static1.squarespace.com/static/5fce61f7744041036fd2a1c3/t/5fd74dc996ed101a3e5cfcba/1607945674983/nujebutisutolaki.pdf
    • https://s3.amazonaws.com/jagux/dinghy_towing_guide_2000.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9a2.bin
cb24d087b6d81face636be647a0843af6ad6ee9bc25bd27772964698f5f4a536
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A2 5308 bytes
font_01_sfnt_off0000dbef.bin
f7adb98d58d57bc74fa237cef2b3ce13c36a141ffa00609294b40ac2ecc2cf64
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 11328 bytes