Malicious PDF — malware analysis report

Static analysis result for SHA-256 7072b503fd3d8085…

MALICIOUS

PDF

105.3 KB Created: 2021-06-11 13:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2a81770da6ee71eca361021127a0e598 SHA-1: 746b7ba126e0cffcc9fee34c3e56ecec2bb9729e SHA-256: 7072b503fd3d8085c3948e6d89088718c8cd2dab9a0e3939ac5e91d9a2e6abb5
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL, 'https://krisoc.ru/pbw?utm_term=december+2019+sat+test+answers', is flagged as suspicious. The presence of these links suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://krisoc.ru/pbw?utm_term=december+2019+sat+test+answers PDF link annotation
    • https://tenaxolisus.weebly.com/uploads/1/3/4/6/134654195/seguvomorilij.pdfIn PDF document text
    • https://kiwemedorupa.weebly.com/uploads/1/3/4/4/134446537/8fbf7f1193e.pdfIn PDF document text
    • https://torudedo.weebly.com/uploads/1/3/4/3/134352944/765ff7538.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426413/normal_5fcaf85817e54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_606d97f002e22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420747/normal_5feccbea8f92f.pdfIn PDF document text
    • https://pupuzufasu.weebly.com/uploads/1/3/4/7/134759867/fefajofedefaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_60bd7cf1bc3e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384320/normal_5ffeabcfc6a61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_6017a5a58e8d3.pdfIn PDF document text
    • https://fojevatiseme.weebly.com/uploads/1/3/4/4/134400043/7133002.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://wotetidi.pbworks.com/w/file/fetch/144637767/do_all_air_fryers_cause_cancer.pdfIn PDF document text
    • http://fumagefad.pbworks.com/w/file/fetch/145068513/22874097010.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144424293/what_water_temperature_kills_fungus.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/f/sirisuwip.pdfIn PDF document text
    • http://dejapitud.pbworks.com/w/file/fetch/144799437/58145137358.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/f/big_ideas_learning_geometry_1_6_answers.pdfIn PDF document text
    • http://razodegotit.pbworks.com/w/file/fetch/144729126/27408494725.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017536.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17536 16716 bytes
SHA-256: df5311d548cc1d6dc798de90779a089abf506f1b72432b2b48bf359f5fe72bd3
font_00_sfnt_off00010e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E85 12828 bytes
SHA-256: 797a88658908732d1b65f0f2a55e6068f0538734f0eb5198115459fa66624839
font_01_sfnt_off000138f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F4 5624 bytes
SHA-256: 4e48e506402f4d4e067c624e97dfdf58bb87be2abb6e1765f2d97908f082cb49
font_02_sfnt_off00014c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C10 12140 bytes
SHA-256: 213a0c106a807b6a46ac879c6e323cbb4290796e9149eaa4184204d734d0e259
font_04_sfnt_off00018cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CEE 2792 bytes
SHA-256: 767a3be232117f13a302c99feaae426ab7672fc476bed27e099bc03d76ff4939