Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5631f6674bc5fe…

MALICIOUS

PDF

64.1 KB Created: 2021-02-20 11:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 70e57afe4146ea32eecc096094c5c722 SHA-1: a97614fc3bfd2a840ce4fd622cabba2e7f281a74 SHA-256: ad5631f6674bc5fe1d914eeb9e9449b01880f4e79dda9e2afaa8b9db521673df
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or scam document. It contains a large number of embedded links pointing to various websites, many of which are hosted on disposable domains or known redirectors, suggesting a link farm designed to distribute malware or lead users to phishing sites. The document body, though heavily obfuscated, contains references to 'Taco bell shredded chicken burrito nutrition info', likely a lure to attract unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=taco+bell+shredded+chicken+burrito+nutrition+info In PDF document text
    • https://cdn.sqhk.co/wunokebewoz/BjfBjfn/nuevo_pase_elite_free_fire_septiembre_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/nagiido/krishna_statue_full_hd_wallpaper.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5fcd608acf2ce.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/i4hhNhh/wsdot_traffic_cameras_vancouver_wa.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/a5jb8wt/mind_blowing_games_to_play_with_friends.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/1hejiUF/gomamefitivajovir.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/hgrLHfD/universal_sonic_nausea_electronic_audible_sound_prank_device.pdfIn PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/5838383.pdfIn PDF document text
    • http://wisevesimo.22web.org/gaxenakifebigofur.pdfIn PDF document text
    • https://cdn.sqhk.co/suxevevagova/o0uha0q/cations_are_positive_because.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/wobuzisibal/screen_wallpaper_free_hd.pdfIn PDF document text
    • http://joluror.rf.gd/economist_intelligence_unit_country_report_cuba.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/dual_boot_windows_dan_android_x86.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/handwriting_worksheets_letter_u.pdfIn PDF document text
    • http://tavarifa.epizy.com/76267244565.pdfIn PDF document text
    • http://xufizup.rf.gd/53261010477.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/homophones_in_sentences_worksheets.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_off0000bee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE9 5264 bytes
SHA-256: f6da51fecfa31d5d32fa98c6a4fc63cf662070f9e81c186bd5478afe83360b03
font_01_sfnt_off0000d0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 9980 bytes
SHA-256: be66abffe7bdb9333d81b902df925c764a402cb68b41e9a136b2f6374af8f68d

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