Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6acf45bca960195…

MALICIOUS

PDF

94.1 KB Created: 2021-03-17 21:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fba31480cfd060955aaf0eaca06dbc44 SHA-1: 979ca112062164528242ba37d185547331fcf2bb SHA-256: b6acf45bca9601959aa06780ac96cc04a25efa5d42777b71d2a36587b366192b
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, including one that appears to be a redirector for a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lozipotod.ru/123?utm_term=complex+fractions+worksheets+8th+grade
    • https://cdn.sqhk.co/zozimevoket/jgd8os9/44478666679.pdf
    • https://static.s123-cdn-static.com/uploads/4370288/normal_5fee8512c3039.pdf
    • http://apeech.ru/nobizugexijixud1p8v.pdf
    • https://cdn-cms.f-static.net/uploads/4476946/normal_60280a0ad641a.pdf
    • https://cdn.sqhk.co/temirikuji/fOuhcki/xidanizigepulovu.pdf
    • https://cdn-cms.f-static.net/uploads/4416506/normal_6018dad708b8f.pdf
    • https://cdn.sqhk.co/tavaxikanabu/ie7RhhU/5322783242.pdf
    • http://bitcoins-profits.com/formula_b_race_cars_for_salejk8a9.pdf
    • https://cdn-cms.f-static.net/uploads/4420025/normal_601b48dae74d7.pdf
    • https://cdn.sqhk.co/pojuwudedi/bHgejbk/gagejuwutuzirubufu.pdf
    • http://salonly.xyz/annabel_lee_main_ideaxa0pu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_fbc74cf1e14c49539c7680a0f5d5a203.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9e901e3f-4bfa-4f5e-96c8-9daa38e82be6/vovewamedazed.pdf
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_2277b871c9f8473a958274806416ff20.pdf?index=true
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_0a58879cc5cd4e95bdf43888b955369a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f9a59ebf-b652-40d2-8b98-44fb0003de4d/47790928489.pdf
    • https://uploads.strikinglycdn.com/files/326090af-1e93-4e84-8698-f7072485dd9a/43838936219.pdf
    • https://uploads.strikinglycdn.com/files/250474f2-36a7-4283-a3e8-c5088da4f889/cfa_syllabus_level_3.pdf
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_0019b581f84d477cbe2eda1ce3b556a4.pdf?index=true
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_350529d990724e86af26c8586f27d821.pdf?index=true
    • https://uploads.strikinglycdn.com/files/af5fa021-8a96-49c2-abd0-9662f9566d35/z_table_statistics_calculator.pdf
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_0c7cb9c03c4946258f4d7eeeda15d478.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010219.bin
657dd65854c8917dcf00f04832558df09075c0b3f8bda6ecdc14b2ddc8004f0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 3288 bytes
font_01_sfnt_off00010de9.bin
45bfd479e7d196e9396dac76963756824be1ea123b8be11126bf2f99f3ab697c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE9 5892 bytes
font_02_sfnt_off000121df.bin
9489d41900884d02c99ffe1c6495a115092ce889d03174eb9b9a2d1ea7cedc85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121DF 14832 bytes
font_03_sfnt_off00015316.bin
f6501b85e5b4b7020dc659630066deeabe42e28dc1cf1fe80e30ead50b53ddeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15316 16608 bytes

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