Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cfe71e79051564…

MALICIOUS

PDF

75.3 KB Created: 2021-03-18 15:38:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 349798285671bdc005ca65cc906377b1 SHA-1: cda683d9c5cead4e4e0c974d472416d52426fabd SHA-256: d4cfe71e790515640de305536d7fbd4f91c6f8f193d662249e78957772a74485
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to potentially harmful content. The document contains numerous external links, many hosted on disposable domains, suggesting an attempt to obscure the ultimate destination or to distribute malware through a chain of redirects. The presence of a 'download button' lure further supports a phishing or malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/123?utm_term=ioptron+skyguider+pro+user+manual PDF link annotation
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/52b7f270a7a0.pdfIn PDF document text
    • http://flowerport.store/ctet_syllabus_2018hbpds.pdfIn PDF document text
    • http://towufugejudet.iblogger.org/effects_of_atlantic_slave_trade.pdfIn PDF document text
    • http://betmoy56.com/dictators_no_peace_cheats_pcigs1k.pdfIn PDF document text
    • https://mufogijagojar.weebly.com/uploads/1/3/1/0/131070489/718f0172e479f.pdfIn PDF document text
    • http://lixixivukagoda.66ghz.com/14317732322.pdfIn PDF document text
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/6415891.pdfIn PDF document text
    • https://retevewaluwur.weebly.com/uploads/1/3/4/6/134600892/9b4bea0.pdfIn PDF document text
    • http://ecoservice-vlad.ru/jetotevcfz.pdfIn PDF document text
    • http://xobagubabawuma.iblogger.org/revuzavonipuwivonumebup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bezukovopobav.epizy.com/nugabalobiguzegu.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_7ee94a959afa473ba22d3bbdbec695c8.pdf?index=trueIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_fbd6fcab7e4b4586987b8dec8fa1e634.pdf?index=trueIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_eec824ca3bdb4d86828c1389e9ca9c0b.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_e8d631d60647416fb3fba565f4af45a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2498b38a-622d-46c4-a9ef-803b29acd49a/how_to_add_page_in_wix_editor.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_3ba8885d01cc45ec86f1671e9439cd5e.pdf?index=trueIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_f2cd95769e2c4a4fa001edada20063eb.pdf?index=trueIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_c50b1110d9f54f3e92a5b3cd2ce9774e.pdf?index=trueIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_d4eedca32732485e89734413218a396d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c27b4f7-5eef-48e7-8de1-4463aef048a7/what_are_personality_assessment_test.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 5384 bytes
SHA-256: d50daf5b60c1af0cc1649ccc09a25ee3565a7bcad72a6ca350094a46bb3d899c
font_01_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 11652 bytes
SHA-256: 5f67995677bc2e95880b17ff340ef1a48383e552cea3b2e429da28d3bc017900