Malicious PDF — malware analysis report

Static analysis result for SHA-256 2587ea15a51153ed…

MALICIOUS

PDF

69.2 KB Created: 2020-12-24 14:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 541d4ffe2c9e4fd93160f6f4ff51bbea SHA-1: d554979f4e91be7e8ffae0406e902533fa780a1d SHA-256: 2587ea15a51153ed9f3ed29d908afdb9f69cd89df635da76ecd0ffc78763e6f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a "link farm" by heuristics. The primary external URL, https://trafficel.ru/123?utm_term=adquisicion+del+lenguaje+segun+chomsky, suggests a potential phishing or SEO manipulation attempt. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent to redirect users to potentially harmful content.

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://trafficel.ru/123?utm_term=adquisicion+del+lenguaje+segun+chomsky
    • https://static.s123-cdn-static.com/uploads/4460966/normal_5fcca9e23463f.pdf
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/2782b8f79e915d3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c4ca9881-8b5a-4c15-9baf-ae648ad00ca1/borderlands_3_characters_fl4k.pdf
    • https://uploads.strikinglycdn.com/files/eb4b6e59-5c57-4920-90d8-291650619547/difomopolibivujozoz.pdf
    • https://uploads.strikinglycdn.com/files/398b63b9-92bc-4d46-a3c1-428a1ae669db/93013672596.pdf
    • https://s3.amazonaws.com/baritexovopa/nj-k-1_instructions_cbt-100s.pdf
    • https://s3.amazonaws.com/muxozuvalubi/47492549178.pdf
    • https://s3.amazonaws.com/megulu/91244911703.pdf
    • https://s3.amazonaws.com/wobuzisibal/xirowijobivugusoru.pdf
    • https://s3.amazonaws.com/donarepemi/72818866164.pdf
    • https://s3.amazonaws.com/zarusegibitumet/secret_lab_gaming_chair_parts.pdf
    • https://s3.amazonaws.com/vutame/context_clues_exercises_with_answers.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_off0000cf7d.bin
e2926bf8fdf3c15270d67ee06e5e785f65e1e8980245620d685d745844517846
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 5616 bytes
font_01_sfnt_off0000e277.bin
daf6cb3c64df248e8ba4f9bf9fe6d584ce45fc7356f6ce5424dad2c1415538c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 11068 bytes