Malicious PDF — malware analysis report

Static analysis result for SHA-256 994f7dc338ffeec8…

MALICIOUS

PDF

82.5 KB Created: 2021-05-11 18:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e9b3750a30fa6ea8d722780f4db35877 SHA-1: 5b2f92eb06623e39053e129b646a39b6743bb114 SHA-256: 994f7dc338ffeec88ea431cf45c973e925ae9766f5ba0b3490d510dbc2b57d5d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://pelibifir.ru/strik?utm_term=new+amazon+lord+of+the+rings+cast PDF link annotation
    • https://cdn.sqhk.co/votojuxosaf/b7DmjdL/adidas_nmd_r1_v2_cardboard.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/jjmAeV3/stickman_warriors_my_craft_online.pdfIn PDF document text
    • https://welaxulisura.weebly.com/uploads/1/3/4/0/134042468/xaxok.pdfIn PDF document text
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/rudofudolo.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/c6JR3tl/bovifan.pdfIn PDF document text
    • http://jakusavu.sportsontheweb.net/55294234310.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/0WjbWgj/letamobesamas.pdfIn PDF document text
    • https://funebaxap.weebly.com/uploads/1/3/4/3/134399245/910200.pdfIn PDF document text
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/455629.pdfIn PDF document text
    • https://buzelobuledu.weebly.com/uploads/1/3/1/3/131397981/5b540a55730.pdfIn PDF document text
    • http://kipokefurur.mygamesonline.org/56828064739.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/xusavuduzeluf.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/DQWgihi/vidolosowewuwavetadoso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tilozirudikobuk.rf.gd/toksin_botulinum.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/xufatewabarexuwijajupit.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/kemedimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/299c4fd7-29e1-436f-b2ea-75578febf2a3/how_to_get_college_credits_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8629a3-4c88-4d47-97c8-1447faf899c2/nafanideweworufujosar.pdfIn PDF document text
    • http://bususetut.epizy.com/roxadumuzunoka.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/kifawaremurojeme.pdfIn PDF document text
    • http://koriwironawuva.myartsonline.com/gewova.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/sadagebiramowipudesitebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32561784-02bc-42f9-81fd-eed968d8cfe0/guwoxi.pdfIn PDF document text
    • http://wezebiwudure.epizy.com/chrome_offline_installer_terbaru_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc650b91-0a92-485a-9ad1-784605e6160f/30673508363.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/denville_hall_cqc_report.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 5336 bytes
SHA-256: 6917e93c4907aad07802d112c22e99468f515efe9480e8281528d07d8721b3ef
font_01_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 11884 bytes
SHA-256: 142a9f2107d1baa2a3a65585d1165e4c536bb3f90a02549b65eaa4ab9e8d3085
font_02_sfnt_off00012dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC8 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34