Malicious PDF — malware analysis report

Static analysis result for SHA-256 d244609ba48c6c1b…

MALICIOUS

PDF

76.6 KB Created: 2021-03-11 04:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0deafee9b6e6490156eb8b6d7f304731 SHA-1: 43dcd7051ba8359330ebe13aa4f937c0eea875d1 SHA-256: d244609ba48c6c1bc24264620f9606e414637f3938a239e808aaf65742d1ec82
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, with one prominent URL pointing to 'jottigo.ru', suggesting a link farm or redirection to malicious content. The document body, though partially corrupted, contains keywords related to learning English, likely a lure to encourage users to interact with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/award?keyword=libro+para+aprender+ingles+rapido+pdf PDF link annotation
    • http://securityverifiedservices.com/how_to_connect_rocketfish_banana_plugsojbdc.pdfIn PDF document text
    • https://cdn.sqhk.co/sabepakofo/g0jbsia/chata_sutovska_fatranka.pdfIn PDF document text
    • https://razomidubijime.weebly.com/uploads/1/3/4/3/134395635/jowole.pdfIn PDF document text
    • https://zikosale.weebly.com/uploads/1/3/4/0/134013107/5663816.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489599/normal_5ff90e435f774.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/h02hcy4/33942241552.pdfIn PDF document text
    • https://netexebi.weebly.com/uploads/1/3/0/8/130815192/jakufatut.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/cours_orthographe_francais_gratuitnod4c.pdfIn PDF document text
    • http://mnclassis.org/68644360619ftlm9.pdfIn PDF document text
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/legalexilokosan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460063/normal_601ce06e998fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387430/normal_60090a41f2458.pdfIn PDF document text
    • https://koxufujemugipad.weebly.com/uploads/1/3/0/7/130739729/ba04f831be27c6.pdfIn PDF document text
    • http://starconflict-game.ru/40748725424jdoiy.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/ecf5437e-db18-4f1b-bddb-078abea06adb/how_to_connect_symbol_barcode_scanner_to_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/teladefebet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41bf7162-60ae-4fa7-99e0-0573bf1f8415/how_to_win_chess_against_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0386f63e-0198-4e95-83cd-682913eada1c/accuair_e_level_kit_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/11073969498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c82d8b35-61e9-4c70-b5e6-7dbd35a8baf5/d_link_dir_868l_change_password.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/balomekakamizugojeson.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/91277210599.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/16883205603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2263a67-49d2-4bcd-a259-78f730923113/rikowenasivogatukojijizoj.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_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 5288 bytes
SHA-256: f7d1f88dd23be5062fb1ff428d8723a727203fcb0140293a0658316a0355aa7d
font_01_sfnt_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 11500 bytes
SHA-256: dd92e8f45854699327ef3cc596958670cf701715a7251c8414bfd67ea6c80d79