Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cd8f64582f3aea…

MALICIOUS

PDF

77.1 KB Created: 2021-02-12 14:12:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ece9e72181756af9ede7ed8fa40737bd SHA-1: 15fa658bef41363705b0ea00e95be094b333b63e SHA-256: a0cd8f64582f3aea7d434fdb0895ca237692e141d7deadbf346a522fe9a7ce76
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, indicating a link farm strategy. The presence of ClamAV detection and ML flagging strongly suggests malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jacksth.ru/wb?keyword=emulator%20error%20android_sdk_root%20is%20undefined%20android%20studio PDF link annotation
    • https://cdn.sqhk.co/rutesawir/aL6oqhp/qs_world_university_rankings_2019_by_subject.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/aggaifD/sidomuzadajur.pdfIn PDF document text
    • https://bisojobiregabo.weebly.com/uploads/1/3/4/5/134509607/kolosatak-bamaxuzirifazet-ronukomej.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/gehfa0Q/recargar_movistar_colombia_pse.pdfIn PDF document text
    • http://zikuwojanubeg.iblogger.org/i_10_traffic_report_arizona.pdfIn PDF document text
    • http://vulefuxudonad.22web.org/jotun_fenomastic_wonderwall_technical_data_sheet.pdfIn PDF document text
    • https://vadopesi.weebly.com/uploads/1/3/0/7/130738994/gafopesujexufet.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/MhdT2MM/paxusonigumasuwinoru.pdfIn PDF document text
    • https://kopezufotixese.weebly.com/uploads/1/3/1/1/131164020/vedod_midosigilaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530910/normal_5fe0e8263b376.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/fUhhOhe/sani_cloth_wipes.pdfIn PDF document text
    • https://gidigodojuk.weebly.com/uploads/1/3/0/8/130874472/7457423.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jexijer/peranowepawowesinuwoxenev.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/display_camera_preview_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/anger_of_stick_5_hack_app.pdfIn PDF document text
    • http://sisuraregimu.rf.gd/blended_amauonline_answer.pdfIn PDF document text
    • http://meresig.epizy.com/android_emulator_access_to_localhost.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_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 5104 bytes
SHA-256: 43ae46d7cc4e65029aacafa64d6dffbad31daeac4da897458fba56d0f4f2e407
font_01_sfnt_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 13380 bytes
SHA-256: 42233e4c87ca27391d8b3e40b41be15c5033a54111f47759095be32a69bef3f5

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