Malicious PDF — malware analysis report

Static analysis result for SHA-256 155fc5169c78f238…

MALICIOUS

PDF

72.3 KB Created: 2021-01-06 03:23:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c11b56fee9b9c3c4cece000c29569c3d SHA-1: bffa71b6517dc919917d0f91575c3f6b945e2291 SHA-256: 155fc5169c78f238ae874c662745db8e6aac2d3a6e433b0b947f3e280949ccc9
104 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI, specifically a URL that appears to be a lure for downloading a movie. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI point towards a social engineering attack to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=wrong+turn+3+full+movie+300mb
    • https://bosonelete.weebly.com/uploads/1/3/0/8/130873804/2460049.pdf
    • https://static.s123-cdn-static.com/uploads/4386618/normal_5fe4d71e4fc0a.pdf
    • https://static.s123-cdn-static.com/uploads/4501214/normal_5fe5e3386bd08.pdf
    • https://cdn-cms.f-static.net/uploads/4413587/normal_5fbc79b72cd70.pdf
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5fb944a1d55a2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e1153955-c51b-48ed-a51c-e66bc42ea2e9/zugesonose.pdf
    • https://uploads.strikinglycdn.com/files/73902547-71cd-45f4-8eff-bcd3fbd0e3f8/funoziv.pdf
    • https://uploads.strikinglycdn.com/files/19c60d3f-7114-4e44-965f-838b53adfdd2/ice_age_movie_worksheet_for_evolution_and_ecology.pdf
    • https://uploads.strikinglycdn.com/files/6b9276b7-631b-435e-9623-c49e0862113c/jehovah_s_witnesses_letter_writing.pdf
    • https://uploads.strikinglycdn.com/files/7be451b1-d507-4f12-80e7-90c3d01cebf9/the_hebrew_heritage_of_black_africa.pdf
    • https://s3.amazonaws.com/subud/77692274699.pdf
    • https://uploads.strikinglycdn.com/files/0a7f384a-20bd-4739-a298-d233740d48ff/63908926892.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca47.bin
b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA47 6744 bytes
font_01_sfnt_off0000db2c.bin
ed77f305d425f21c1286e870836a1b3b129aeabea76bc8e368852b9b34cc8a4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2C 5216 bytes
font_02_sfnt_off0000ecfa.bin
35e2b7304ae7aab12622b42bd818fc3c2dc2d35b935d5fd8a0df61c518b39715
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 11312 bytes