Malicious PDF — malware analysis report

Static analysis result for SHA-256 353592c94003f2d9…

MALICIOUS

PDF

78.1 KB Created: 2021-04-01 02:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4aad322449c3a40edf21af1e2c08cfff SHA-1: 1484f237ea48aabef7d260b14d1155ff53ec3ec6 SHA-256: 353592c94003f2d9a217b108eb3ba2d7e546d1919b117186743932c791191974
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation scheme. One of the extracted URLs, https://bologen.ru/123?utm_term=personal+statement+for+job+application+template, is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://bologen.ru/123?utm_term=personal+statement+for+job+application+template PDF link annotation
    • https://waxitajoxozaner.weebly.com/uploads/1/3/4/4/134474673/pagarabaruvi-gezivometa.pdfIn PDF document text
    • http://art-practice.org/lujagewurefexezn5ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_6059c3d57ac7d.pdfIn PDF document text
    • http://thehensleys.org/91392862301sjs8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_600a24871cbec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408992/normal_6006b3f8b8dee.pdfIn PDF document text
    • https://mubazujozij.weebly.com/uploads/1/3/4/7/134705676/ce13553c.pdfIn PDF document text
    • https://xisobapujizutu.weebly.com/uploads/1/3/4/5/134585888/fajenume.pdfIn PDF document text
    • http://tiktokhd.design/90023548059p84l6.pdfIn PDF document text
    • http://itsnat.space/write_an_equation_in_slope_intercept_form_from_a_graph_calculatorsq3pg.pdfIn PDF document text
    • http://nigma24invest.online/amphibolite_rock1snlj.pdfIn PDF document text
    • http://mon-cmbretagne.com/feelings_faces_cards7kmzv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451574/normal_6003dbc575cc5.pdfIn PDF document text
    • https://nuzoligul.weebly.com/uploads/1/3/3/9/133997434/palalemunarif-kasidigabajati-nekezod-legoxijinezi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/488d4296-3fd4-4707-a309-ca2f582394b4/kemulijef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb89eaa-3d12-4f1c-830b-46f38b675373/vefub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5a7d185-ab52-4227-8003-32649daf8fd0/sandisk_sansa_fuze_mp3_player.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d60aea-1d8a-492b-b9a9-bcac4d038bb3/statistics_for_management_and_economics_11th_edition_download.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_90b0b39b90b14f6683a60bc2db45f19a.pdf?index=trueIn PDF document text
    • https://2eb5e741-fe40-4e13-9a70-20af0821b154.filesusr.com/ugd/6cf56c_2e7c77484ad44f81bbca90912b5c20b1.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 5380 bytes
SHA-256: bfc7a149a0b0bacf6ba91e1d3d580490b00334527f214e42f8f4c3f182b79bbd
font_01_sfnt_off00010400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10400 10924 bytes
SHA-256: b544b6223eaf2540c024ffe8f0d997146f5b74566dd105e59e5725807b16add2