Malicious PDF — malware analysis report

Static analysis result for SHA-256 7baa84e6a023b6b4…

MALICIOUS

PDF

80.2 KB Created: 2021-03-11 05:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac4cadb4732e87f38f2902bcd8dd1e38 SHA-1: d0b1f42bb65e97802b252c2ff07e9e172b465bf4 SHA-256: 7baa84e6a023b6b425939172dfd5ca0ef021345c73cf7a1bf9a7882f06878318
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains including 'presente-top.store' and 'investmag.org'. The document body, though heavily obfuscated, suggests a lure related to 'Acorus calamus review pdf'. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/award?keyword=acorus+calamus+review+pdf
    • http://presente-top.store/59346395157rzmil.pdf
    • http://investmag.org/60412752389uvq6v.pdf
    • https://cdn.sqhk.co/borefigux/ciehagc/tomb_runner_app.pdf
    • https://cdn-cms.f-static.net/uploads/4410462/normal_5fd9c64926243.pdf
    • https://cdn.sqhk.co/juvanejejuwo/jbgjFGG/tech_geek_meaning_in_english.pdf
    • https://static.s123-cdn-static.com/uploads/4418188/normal_5ff275d2aa287.pdf
    • https://cdn.sqhk.co/tinulafi/jcFVgdM/mexutulikazitedanezufip.pdf
    • https://static.s123-cdn-static.com/uploads/4367302/normal_600639a29a6cf.pdf
    • https://cdn.sqhk.co/bujugasefoli/iidwM4k/magic_cafe_legend_cups_and_balls.pdf
    • https://cdn.sqhk.co/kokuxisa/hcSheCp/ladoz.pdf
    • http://nasty666.space/fantasy_world_map_templateewf86.pdf
    • http://avto-document.site/tarkuotu_bulviu_apkepas_su_grybaisfxhqd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/84ed1b2b-e59d-49ec-a205-97819e0a635e/ley_organica_de_propiedad_horizontal_vigente_en_venezuela.pdf
    • https://uploads.strikinglycdn.com/files/775bb2f6-d30f-4d81-b98d-f39fe479dbea/31210242210.pdf
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_d8bcdda0e434486ca0e32edd7fe502de.pdf?index=true
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_fa2f6d54a65e4da48893c27fc3f150dc.pdf?index=true
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_9caf784029cc49af88bc868b52489640.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d69449d5-8975-4ea2-87fb-abb6e48631a9/basic_trig_identities_quiz.pdf
    • https://uploads.strikinglycdn.com/files/e40a85b4-73ee-45dc-a3a2-8dc5bc500f84/84552117030.pdf
    • https://uploads.strikinglycdn.com/files/b4ce2ce1-f5df-4e44-b4be-16272127d97c/par_quoi_remplacer_la_fve_dans_la_galette_des_rois.pdf
    • https://uploads.strikinglycdn.com/files/0fe3e9e3-a23b-4706-8f4a-321c0ea89276/8634243194.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f151.bin
233a79eed05cfcfb5b3acf750d224fb7602bf048e6207bb8129c26f626b2a8e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 5140 bytes
font_01_sfnt_off000102de.bin
8f9604666bcca0828755098e64256583cee21e8e8a09bcea1e9010d80d81f5a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 10172 bytes
font_02_sfnt_off00012567.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12567 4324 bytes

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