Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7339fe3631deb0f…

MALICIOUS

PDF

70.5 KB Created: 2020-11-19 02:26:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e17e13acf5461a00fa6746b735b6a509 SHA-1: 19cc68bf3ac4f12afaf9ab0a23593270916bfb53 SHA-256: f7339fe3631deb0f02adbdcf2519e0ad006a8e2e1c9a634c92df9214a6493ee9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on file-sharing or blogging platforms, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=rumeysa+gelgi+instagram
    • https://tunugezujemis.weebly.com/uploads/1/3/4/3/134307821/1022302.pdf
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/916016.pdf
    • https://cdn-cms.f-static.net/uploads/4384470/normal_5fa41d5c69b2f.pdf
    • https://kanudepu.weebly.com/uploads/1/3/2/7/132740929/pemogimunavuniliri.pdf
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5f9234b1965e5.pdf
    • https://lajibomigijiku.weebly.com/uploads/1/3/4/5/134587714/6979704.pdf
    • https://wagizubim.weebly.com/uploads/1/3/4/4/134470033/9d98eb9.pdf
    • https://cdn-cms.f-static.net/uploads/4386621/normal_5f8dfa5f2d04c.pdf
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5f8b5c721f588.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/79a300d3-2bb0-4661-9947-8fd396de58d2/rezezakuvazafaze.pdf
    • https://uploads.strikinglycdn.com/files/c86bce6b-7f4c-43ff-a463-8c66a22a76fb/80733705393.pdf
    • https://s3.amazonaws.com/fosagoba/happy_new_year_movie_song_bestwap.pdf
    • https://uploads.strikinglycdn.com/files/a9fc4a5f-985b-4a36-bd44-a404b26e9235/organic_chemistry_student_solution_manual_study_guide_3rd_edition.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_off0000d54e.bin
aca5856d50a1f812df4f92116ee4b7b112b1fe0f16b4f79579a607571e84d682
pdf-font-stream PDF embedded font (sfnt) at offset 0xD54E 5112 bytes
font_01_sfnt_off0000e6a9.bin
baf2486e799c9b03430211532205f6f43a90c0be5ac8a12d3788e03ba21b6d80
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 11980 bytes