Malicious PDF — malware analysis report

Static analysis result for SHA-256 95031b1e8822534c…

MALICIOUS

PDF

88.3 KB Created: 2021-03-16 08:28:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4619252139aab519250d04d6f75a37ac SHA-1: bd7514850c80068f729f523326ee37e41f2487bf SHA-256: 95031b1e8822534cf51a95fe147888dbc773145821762d3a0e6327009ce94133
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, with one primary URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=mississippi+high+school+football+scores+8%252F23%252F19
    • https://cdn-cms.f-static.net/uploads/4462736/normal_602d80561e2cc.pdf
    • https://static.s123-cdn-static.com/uploads/4416304/normal_5fee9831d6e0b.pdf
    • https://labajamipudoxa.weebly.com/uploads/1/3/5/3/135399896/4010252.pdf
    • https://static.s123-cdn-static.com/uploads/4415974/normal_5ffde1834ef36.pdf
    • https://cdn-cms.f-static.net/uploads/4485587/normal_600aba3a7ab8d.pdf
    • https://legonetu.weebly.com/uploads/1/3/4/5/134585206/rawikugigig_tuladepotomax_lebuw.pdf
    • https://lovebaxubifutu.weebly.com/uploads/1/3/4/3/134322000/572187.pdf
    • http://mamimufexaliro.66ghz.com/ponuninas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/watajive/tovagepazapuf.pdf
    • http://xerotoxivedeme.epizy.com/mathematics_2_textbook.pdf
    • https://uploads.strikinglycdn.com/files/6e55f641-93c0-4ffb-8891-15b78e471d57/how_many_calories_are_in_an_arbys_slider.pdf
    • http://nigojelur.epizy.com/68904274833.pdf
    • https://s3.amazonaws.com/xoferuzu/cardio_workout_gym.pdf
    • https://uploads.strikinglycdn.com/files/e1c812c2-004b-4c63-8491-3f11a30a5c4d/makafukezonota.pdf
    • http://wixevudu.epizy.com/android_api_19_version.pdf
    • http://vatasinunevuto.epizy.com/california_traffic_citations_online.pdf
    • https://uploads.strikinglycdn.com/files/1d9dd8a1-0877-4873-b3f8-071313f1f520/star_trek_voyager_threshold_non_canon.pdf
    • https://uploads.strikinglycdn.com/files/5ce7d9fd-7efd-48ad-812b-2592d3f1c5f6/singer_360_knitting_machine_manual.pdf
    • https://uploads.strikinglycdn.com/files/f2bfb109-d419-447f-8256-0e7ecce36162/58251604578.pdf
    • https://uploads.strikinglycdn.com/files/c9c28c3d-1b66-4fcb-8f94-7103e59af0ff/the_rise_of_scourge_online_free.pdf
    • https://uploads.strikinglycdn.com/files/6c041eaf-1934-4f9b-8470-4283f0ef4a85/how_to_treat_arthritis_in_the_neck_naturally.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_off00011962.bin
e15d8f13825c01b999329074be0bdc493d79aff61ca6388f6d2fdc45bb8f216b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11962 6156 bytes
font_01_sfnt_off00012e5c.bin
8bf70550af9fe0e88af8e98eb44ab2235b60256a0713cc28e6c965741d9c9964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5C 11084 bytes

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