Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c41a68a6caf3e2c…

MALICIOUS

PDF

81.5 KB Created: 2021-03-10 06:00:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cb061123698bdd75b7424cd473675ac6 SHA-1: 2d36c92bfc3677ba16124fd85268142c29aaf0d8 SHA-256: 1c41a68a6caf3e2cad19ed4654c483a658d46166d0ff524cfd41d937d86cb15e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of embedded URLs and the overall structure suggest an attempt to distribute malicious content or conduct phishing operations. No scripts were extracted, but the PDF's nature points towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/strik?utm_term=the+selection+kiera+cass+movie+cast+netflix PDF link annotation
    • http://fexevewuli.mypressonline.com/the_book_thief_full_book_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/iijbjgV/big_keys_for_typing_keyboard_with_keyguard.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/gheX5P0/72003489557.pdfIn PDF document text
    • http://wersita.space/bissell_powersteamer_powerbrush_manual_1697qppdl.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/cgd1jhB/83296727531.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/miss_universe_2018_question_and_answer_transcriptix72l.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/dos_command_examples_batch.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/2Fhhljj/mcdonald_s_nyc_promotions.pdfIn PDF document text
    • http://soul-felt.com/92526015659erzik.pdfIn PDF document text
    • https://cdn.sqhk.co/gaduwifawide/JhjJhea/pibizuwodujomosajobudu.pdfIn PDF document text
    • http://drenajkrasnodar.ru/42893766705ktqra.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/jbjdgTO/bivaj.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/7udO420/66587827247.pdfIn PDF document text
    • http://thiswaytovogue.com/clash_of_lights_apk_download_85_mbr3yl3.pdfIn PDF document text
    • http://circleshtang.xyz/1411744878d7cfs.pdfIn PDF document text
    • http://meetsol.xyz/wululuzolulowowasudutud1ghww.pdfIn PDF document text
    • http://koreanluxe.com/9299995762208vz.pdfIn PDF document text
    • http://wersita.fun/serta_motion_essentials_3_reviewc8l96.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/aQmifzU/16760671843.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_a23dde2662ba435fbabd10ae00f5e784.pdf?index=trueIn PDF document text
    • http://zubiluwetij.myartsonline.com/the_art_of_communication_quotes.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_bd42b14e26f24bf0a6aa1066db8adbb0.pdf?index=trueIn PDF document text
    • http://zogadawedalifap.onlinewebshop.net/74074992193.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_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 5260 bytes
SHA-256: b4d43ced65cce459be70c861f382cb9021004c86e1103bb0bf0cf2e55c1b4342
font_01_sfnt_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 11244 bytes
SHA-256: fd0d9b63a3bb960e3fc63c0d5a85bb32baa12b6a018427ee574b5aa58f36ae76