Malicious PDF — malware analysis report

Static analysis result for SHA-256 c012b60c4066313f…

MALICIOUS

PDF

85.2 KB Created: 2021-04-08 01:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d701335e71c20b425d3bf7f09e271b42 SHA-1: 1bd35f463e6a82407ff0191e207675f220825b69 SHA-256: c012b60c4066313f8f38f0b27c60be7ac9cd10cd225f4ec1ab98abe922f46302
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links disguised as a study guide, aiming to redirect users to potentially harmful websites. The presence of embedded URLs and the link farm heuristic indicate a strong intent to direct users off-site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wix?keyword=biology+2nd+semester+final+exam+study+guide+answers
    • https://cdn.sqhk.co/denirinodo/igHgfjg/dinner_places_near_me_open_now.pdf
    • http://nomenowunesazoz.scienceontheweb.net/89006393547.pdf
    • https://merugerizun.weebly.com/uploads/1/3/4/3/134337850/lefonalexezitim.pdf
    • https://dinadexoliba.weebly.com/uploads/1/3/6/0/136091941/liwokelasibafemoza.pdf
    • https://pafodezeba.weebly.com/uploads/1/3/4/5/134589846/pazeva-sagik.pdf
    • http://giveaway2020.info/966750748018xnru.pdf
    • https://cdn-cms.f-static.net/uploads/4426261/normal_6065589974b3c.pdf
    • https://static.s123-cdn-static.com/uploads/4460251/normal_5fc774027a49c.pdf
    • https://cdn.sqhk.co/govamopega/jxj5ggg/xufefezomodu.pdf
    • http://everydays.space/19081369539fq6h6.pdf
    • http://zijaditenup.getenjoyment.net/asme_section_viii_2020.pdf
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/moxenetopujan.pdf
    • https://cdn-cms.f-static.net/uploads/4454286/normal_5fd6c48f2c01e.pdf
    • http://simultaneously.space/maxirafulonadopekuwunobctwd.pdf
    • https://cdn.sqhk.co/pirujezexod/ehigNhf/tabixovapelokar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jokubamobivavum.onlinewebshop.net/lizumu.pdf
    • https://s3.amazonaws.com/babetafaperaxov/letiri.pdf
    • http://nosawakudik.myartsonline.com/citrus_college_campus_map.pdf
    • https://s3.amazonaws.com/loxopudizus/32336278865.pdf
    • https://s3.amazonaws.com/fibesezati/kinuneguwipaz.pdf
    • http://fararisujis.myartsonline.com/nawegomulevi.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_off00010898.bin
b9eaaaa34a97f8ddcd630e897cb252ad94038bfc43738bfc00f6851b31b90121		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 5672 bytes
font_01_sfnt_off00011bf4.bin
4af105933d0f4e5fd5b11919c28ca489f7f03ea6dd51f07360aaaae207438847		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 13016 bytes

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