Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33cb2de407bcafe…

MALICIOUS

PDF

76.7 KB Created: 2021-03-31 01:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b2382380eeb3d6abc5277c204423d90d SHA-1: e62300c86a2364d1a1688230e184dec5ea741b97 SHA-256: c33cb2de407bcafe631d041a16637e664af797cd9f6cda2abf9a1803513e6949
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 embedded URIs, with a significant number pointing to disposable hosting or potentially malicious domains, indicating a likely phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=do+dachshunds+have+two+coats PDF link annotation
    • http://mosquito.codes/ls_vtec_conversion_guide1reg3.pdfIn PDF document text
    • https://wetusaseri.weebly.com/uploads/1/3/5/2/135297966/teroviwizarudet-sesoka-nituwosuro-kobijabojikobi.pdfIn PDF document text
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/5546446.pdfIn PDF document text
    • https://raralafelu.weebly.com/uploads/1/3/4/4/134476833/rafifiwu-fuxiz-notuwagulosin-lubefuxasi.pdfIn PDF document text
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/ba3f840a609.pdfIn PDF document text
    • http://emirofficialzm.com/friendship_kavithaigal_photos2stj7.pdfIn PDF document text
    • http://nijavugev.22web.org/86935048154.pdfIn PDF document text
    • https://vipomumukewa.weebly.com/uploads/1/3/0/8/130813786/c8a717336ea.pdfIn PDF document text
    • https://sisekiki.weebly.com/uploads/1/3/4/6/134622657/roguvanogexek.pdfIn PDF document text
    • https://peguduzivinaw.weebly.com/uploads/1/3/1/6/131606374/dusuguzojavukuzipizo.pdfIn PDF document text
    • http://instasurprise.online/330151778759u4xf.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/8f87ea70720b64.pdfIn PDF document text
    • https://wapojopaboxijok.weebly.com/uploads/1/3/4/7/134747084/nogexoguri_mipeduvonebova.pdfIn PDF document text
    • http://medicinfo.online/25898224684z7s1l.pdfIn PDF document text
    • http://tabikola.online/how_to_fix_windows_7_using_command_promptm498q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kebanibaru.epizy.com/68600770725.pdfIn PDF document text
    • http://borowif.epizy.com/sage_accounts_50c.pdfIn PDF document text
    • http://jiboleramar.epizy.com/69908103783.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/29679063895.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/narrative_analysis_qualitative_research.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/dirijuzajexegujojosigama.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/safe_drive_save_life_programme_report.pdfIn PDF document text
    • http://vumubogapem.epizy.com/gupiwufepemojixesoxuna.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/ct_guided_si_joint_injection_cpt_code.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_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 5048 bytes
SHA-256: d0d306f81e9645623f2222e7c197302dd34801e245ce9dd828474a5b0cc3119d
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 10452 bytes
SHA-256: 91dd155bf8281435228fade9b914dc30e13db29c62119ccddbeb2fba4e3096cc

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