Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6b71e888ba0ffa…

MALICIOUS

PDF

81.4 KB Created: 2021-03-25 13:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 169a244aade3e9da8cf45a6d51e30978 SHA-1: 794ce011acfb7541c0780f2c0a14ca8600738154 SHA-256: 4d6b71e888ba0ffab48952e2f19eeda950b36233f855c4302291203a82021154
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on suspicious domains and appear to be part of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://xajibur.ru/award?keyword=linux+admin+interview+questions+and+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420260/normal_5fde9041a8a02.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/jggHjeS/23815111284.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/jhgRKgc/dominos_deals_7._99.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/TjhghyA/87918460454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450147/normal_5fdc4643d190b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_5fdc35b18cf56.pdfIn PDF document text
    • https://zukixemafeka.weebly.com/uploads/1/3/1/3/131398149/liwevosita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_5fe8fddedd49e.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/j5dTigS/bulugemeziruvobewelataf.pdfIn PDF document text
    • https://pujezifug.weebly.com/uploads/1/3/0/7/130738771/vupirolesitu.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/ahacwUX/79073317732.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/UgcifuX/91295343309.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/jhoyqpp/lagu_hyuna_bubble_pop_mp3.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/xamibebulosaxug/amazing_grace_jazz_trumpet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/clean_sheet_meaning_in_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/angry_bird_movie_hd_tamil_dubbed.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/how_to_maintain_my_roomba.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/pegotisurasalanomikakawes.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/fairy_tail_snow_fairy_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/ambience_sound_effects_free.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_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 5440 bytes
SHA-256: b2c4dbfc8165a2ded476ad0caa64036b56e45fe48aaa0b507d35f19e32a35645
font_01_sfnt_off0001157a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 10544 bytes
SHA-256: 9b69eafefdb017f18890b53a41b3e3bc43867ac20f43599c37df67c517498f54

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