Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a36fd8c62b4483…

MALICIOUS

PDF

74.3 KB Created: 2021-01-23 06:59:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: dcb37c2b0a955a05bf80e18bea617a5e SHA-1: 912bc56793b69997762c6b7faac92127ac09221c SHA-256: 53a36fd8c62b4483fe2b9ff971ec9a89e63d983a144a77a236b8752fb420f023
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains and hosted on services like weebly.com and cdn.sqhk.co. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/aws?utm_term=sheet+pan+smoked+paprika+salmon PDF link annotation
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/gazawezigisagu.pdfIn PDF document text
    • https://cdn.sqhk.co/segenapiza/dicyjec/basketball_shooting_game_21.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxovunevo/jhxig3e/numagepuxuvebumeke.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/gdhhjil/sazajevavuxije.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/3flH9gj/musujigevipifozenoroma.pdfIn PDF document text
    • https://cdn.sqhk.co/gujamozulas/r1jfgjC/puwanidojid.pdfIn PDF document text
    • https://cdn.sqhk.co/parapirer/RFoRWZS/88659520206.pdfIn PDF document text
    • http://pijakonojimuw.iblogger.org/film_gaspar_noe_love_3d.pdfIn PDF document text
    • https://nutiniwe.weebly.com/uploads/1/3/4/8/134870290/b1d8b2baa8fe0.pdfIn PDF document text
    • https://jogijomovap.weebly.com/uploads/1/3/0/9/130969693/4307029.pdfIn PDF document text
    • http://kuroramogesok.iblogger.org/audio_spotlighting_seminar_report_ppt.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/ghghfjf/74949600833.pdfIn PDF document text
    • http://kokilubowo.22web.org/fizidarezidudinepexow.pdfIn PDF document text
    • https://linajijokib.weebly.com/uploads/1/3/4/0/134000065/julividadebivududo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kixulal.rf.gd/sojasesuzepalajazekin.pdfIn PDF document text
    • http://satekivu.rf.gd/40624519472.pdfIn PDF document text
    • http://mesesoriran.epizy.com/mifojubivir.pdfIn PDF document text
    • http://betiravel.epizy.com/basic_instinct_2_full_movie_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/mp4_video_song_website.pdfIn PDF document text
    • http://ravuxigud.epizy.com/rokemura.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_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 5364 bytes
SHA-256: 0d79195cd020e0625bd214b72fe6fd5f7640da967107b934dc7d5bed7b0c6c39
font_01_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 10180 bytes
SHA-256: ba9190fbdd8367246305969430ab3fc3642d82fa48cd3559d08f774528f34b08

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