Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c391022fe0356f…

MALICIOUS

PDF

91.2 KB Created: 2021-03-16 17:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa53e72209df3b40826f4cc161b986d3 SHA-1: b0245af01236db86987f21586c6a5b69deb1e5cb SHA-256: 80c391022fe0356f74e4171426fc32869e59195817086bcce4c3a69d0ba25ad4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on dynamic DNS services and appear to be part of a link farm designed to attract traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://resalured.ru/wix?keyword=kud+puklo+da+puklo+sve+epizode+nova+tv
    • https://cdn.sqhk.co/retobumoki/figcCjf/69686146998.pdf
    • https://cdn.sqhk.co/ruvonusebex/hb5jgNy/bloons_tower_defense_5_unblocked_games_66_hacked.pdf
    • http://menuralu.22web.org/32461937342.pdf
    • https://cdn.sqhk.co/nagebagem/68jgic3/brick_breaker_quest_level_75.pdf
    • http://ludoritepiru.22web.org/weezer_africa_song.pdf
    • https://cdn.sqhk.co/ninuxoti/2NFfjiG/plinko_master_legit_money.pdf
    • https://gojefizabefav.weebly.com/uploads/1/3/4/8/134890321/lodupilop_direnag_zibit.pdf
    • https://cdn.sqhk.co/zerumowo/fjedgdz/how_to_get_race_against_time_eso.pdf
    • https://jazezuko.weebly.com/uploads/1/3/4/3/134389352/5924738.pdf
    • https://cdn.sqhk.co/tinupolureg/jchaijO/39014253484.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_0dc91bf891d34e519c7258168d43a55a.pdf?index=true
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_cc93348648b04aefbd60b2d364403c10.pdf?index=true
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_364249f6ce2b4b40a9368500ebea35b2.pdf?index=true
    • http://tolevekup.epizy.com/79404925194.pdf
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_60d579c732134af083057eece633874f.pdf?index=true
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_d629119d5be34c8897b01e95dba1a342.pdf?index=true
    • http://vizepojuduw.rf.gd/wapiwurademolozewimenimi.pdf
    • http://gemewepibi.rf.gd/borakimewinifuva.pdf
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_4434399f090a4ca6aa3f57ddf4743d3f.pdf?index=true
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_58d9572ca0d7494b98fea6080d179952.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef54.bin
03a96bffe30fc28812a7725e9b3e30aa40142241f9c3937291eaca11f2bcafca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 5604 bytes
font_01_sfnt_off00010192.bin
ae0093ab3318ffe05532b9d443bbd0696a1ca8c3a0010be37f2226993a05f6f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 4880 bytes
font_02_sfnt_off00011248.bin
5941b6a56756698c7e6e3d31b97c44d6842af8ce913d4b57f947af560354f5b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11248 12388 bytes
font_03_sfnt_off0001399d.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1399D 16204 bytes
font_04_sfnt_off00014ecb.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14ECB 4324 bytes

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