Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce83195557a0a94…

MALICIOUS

PDF

84.6 KB Created: 2021-03-22 08:08:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 905a4506a09fca1230f3dc421a04e624 SHA-1: c704b5b62cb3b87fb740369d0af298306c2f93e4 SHA-256: 4ce83195557a0a94edfd0a4d580e8339d2e44e53e426a5c6766b0a3c851d7f91
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous external URIs, one of which is hosted on a disposable domain and uses UTM parameters, suggesting a phishing or spam campaign. The document body, though partially corrupted, contains text related to a 'breast cancer biopsy pathology report', indicating a lure to entice users to click on the embedded malicious URL. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing attack.

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://botokaw.ru/123?utm_term=breast+cancer+biopsy+pathology+report PDF link annotation
    • https://cdn.sqhk.co/kuderoxuz/hjhjiiZ/free_music_download_website_with_album_art.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404497/normal_60300b6ab01ab.pdfIn PDF document text
    • https://mijutadozas.weebly.com/uploads/1/3/4/5/134590660/2b0e104e.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/gX9vmTz/party_music_video_beyonce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489041/normal_604a28083f21d.pdfIn PDF document text
    • http://sejapamuji.22web.org/skinnytaste_cookbook_index.pdfIn PDF document text
    • https://zonilalafujagep.weebly.com/uploads/1/3/4/7/134731182/3552471.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485308/normal_5fcdc62d36a5a.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/Ebjc1FP/money_maker_lyrics_fredo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464874/normal_6047bb84961a0.pdfIn PDF document text
    • https://cdn.sqhk.co/pometobab/cigmha1/86263197684.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/eFIieVz/feed_instagram_app_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a31d3ee-b980-4f9a-8d74-c526ae6e3029/filufiduwixejoribus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba07aba9-3a41-4372-953d-29c0a7e45e16/burger_king_dollar_menu_prices.pdfIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_442be597c8e54d79a6f081c5bb6f3e11.pdf?index=trueIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_4100037ae898450fb822481cf1f97717.pdf?index=trueIn PDF document text
    • http://xajojunedaxuda.epizy.com/dirobe.pdfIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_df1a2ddb18d747fe957b6c754c883c5b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f55edca-7fd8-40ab-86e7-2650d12b260e/how_much_do_football_managers_get_paid.pdfIn PDF document text
    • http://favuzokusom.rf.gd/2362163782.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_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 5488 bytes
SHA-256: c0982700fdf76b1839a5ce06b8bdc8f50d6fa86ca7c23c832134603b6db0b561
font_01_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 10744 bytes
SHA-256: 77095cfad00d1d86e7b5ced7e9dc88673023e9fa08b70efa09f3fcb9b9b6bf33

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