Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc027a8cea76d29…

MALICIOUS

PDF

84.7 KB Created: 2021-03-08 01:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7f7fdd5be11795d62c87be283a0b00ca SHA-1: 01a9c0ff0c58f1eb810e95a95b45116a53ff59de SHA-256: 8fc027a8cea76d29d37b650146924bff7b993e627ebea2aed8decc4f5a8a0d5f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

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 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://druttle.ru/award?keyword=ukulele+songs+for+beginners+chords PDF link annotation
    • https://cdn.sqhk.co/valujoper/jjchga7/ninja_kitty_self_defense.pdfIn PDF document text
    • http://opit.space/votefadij11tx.pdfIn PDF document text
    • http://pubgucbayim.com/how_to_change_my_voicemail_numberpbraa.pdfIn PDF document text
    • http://hookup157.fun/essay_writing_for_english_testsu683y.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/8ibw1AE/subway_surfers_characters_names.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/cRVIhi3/tupepexe.pdfIn PDF document text
    • http://verification-help.business/fiwijomudalomu21ilp.pdfIn PDF document text
    • https://cdn.sqhk.co/mamidusidozu/xlhbjcS/13156705572.pdfIn PDF document text
    • https://cdn.sqhk.co/zevijevam/hiijzhh/69567584282.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/nuxulikiwab/32148060240.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/pinkfong_baby_shark_remix.pdfIn PDF document text
    • http://bufefotekakosed.epizy.com/the_courts_of_heaven_david_herzog.pdfIn PDF document text
    • http://zumadibud.epizy.com/ikea_malaysia_sale_2020_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/veneer_eroded_font_free.pdfIn PDF document text
    • http://toduwez.epizy.com/vinyl_sheet_flooring_omaha.pdfIn PDF document text
    • http://tuwobema.rf.gd/bahubali_1_hd_video_songs_telugu.pdfIn PDF document text
    • http://taxowojo.epizy.com/56828858429.pdfIn PDF document text
    • http://lafugigolemetuk.rf.gd/kemojevod.pdfIn PDF document text
    • http://pafojamivorizim.epizy.com/50_shades_freed_ice_cream_scene_book.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_off00010f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F91 5268 bytes
SHA-256: 86b6817ee40184e8862ef43f07a04e269da2a8ee104c01bf53558176941f217d
font_01_sfnt_off0001217e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 10472 bytes
SHA-256: 224cb5dc24f286a33b982abedf2537ba1ac32db4c695010f919a29b26a94004a

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