Malicious PDF — malware analysis report

Static analysis result for SHA-256 2706479fdf9d1a58…

MALICIOUS

PDF

66.8 KB Created: 2020-11-24 00:07:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 17f7864b7167d0cdb3fa700da6258f8f SHA-1: 181b77e9d6451b64888d0462f1f550b3964590cf SHA-256: 2706479fdf9d1a58de49a8fd15d2369b757f8659ac0694b3bd7d93ca8e424870
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing document and has been flagged by ML classifiers and ClamAV as malicious. The embedded URL and document body suggest a lure for downloading the 'Skygofree' Android application, likely a trojan. The presence of numerous external links also points to a link farm or SEO poisoning tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=skygofree+real+download+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489730/normal_5fb022ca9521e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5f96ecc395131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408864/normal_5f9d972d60e69.pdfIn PDF document text
    • https://fikamuvereza.weebly.com/uploads/1/3/4/7/134754658/9951916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450418/normal_5fbc31384abce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5f9eb5bff3455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426556/normal_5fa2672809c33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/53cb5b9c-d14f-42f3-9fd4-61e6ebc8e9c8/99090077832.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/jiwaregeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1654e179-f7a5-4ee0-924c-14700f34db34/st_louis_county_mo_recorder_of_deeds_search.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a160a1-0b32-44ec-9555-bebc4f17a931/taluseweso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc6c84c2-c199-45a1-8c47-7bfbc37d1bbf/dufabapezazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1aebe01-f9d5-42fa-94e6-ca59b61b19a8/81347969666.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_off0000ca82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA82 5256 bytes
SHA-256: d8db058c357447d1ca15156b435830b983d763cf3b88baa1e1b8d3b69db1bcc0
font_01_sfnt_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 9888 bytes
SHA-256: d8384d96ac9bd1dedb32e2737fa4a388256fd6569c55c9d5347c0f643674009c

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