Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc6a9467b18cd12…

MALICIOUS

PDF

89.0 KB Created: 2021-03-28 16:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 63b114ec9e75072815ffafc59dccc8c0 SHA-1: 90abad1572f3f5812e4132440ffa2e78f3aeb25c SHA-256: 8bc6a9467b18cd1221b9d1b74692b295eb532d69545c3ab7c2e2bece6af6c486
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO abuse tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://kuzutuzo.ru/award?keyword=learning+teaching+3rd+edition+student+s+book+pack+pdf PDF link annotation
    • http://palopepidek.mypressonline.com/ketuxodid.pdfIn PDF document text
    • http://erogan-oficial.site/xudexaroxumisizanubidozijhnlc.pdfIn PDF document text
    • http://kvrovk.xyz/20392260136epymh.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://rusagobaloregir.22web.org/10021849241.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/70745139077.pdfIn PDF document text
    • http://bebalezuve.medianewsonline.com/coffee_consumer_buying_behavior.pdfIn PDF document text
    • http://drenajkrasnodar.ru/22628577222lj3yh.pdfIn PDF document text
    • http://digtalcaliper09.xyz/thank_you_very_much_for_responding_to_my_email93bm3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_f45bac5c22ae4b819545ce8c8dc63540.pdf?index=trueIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_8cd3b7ee438b445e984d0ec69a1816bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ff3386-b021-4f08-a059-d50cdec942fc/gevexapawobenovu.pdfIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/i_am_not_okay_with_this_book_barnes_and_noble.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f320dee1-8fed-4099-a329-4d2f57abb4aa/r_santhanam_books.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_be98b3464d294a93981fc39b4b80d78d.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_9bbc76597b7e4cc2ae56a3e6e81fc7eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19647b98-75d4-43db-b5d7-554395e9628a/10181256357.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_72b5030c9e544d8e8b43c5d1c2b9c062.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_98db1b30668f4f77b940c1ac16c36d21.pdf?index=trueIn PDF document text
    • http://xamawesurasido.epizy.com/how_to_make_your_ex_girlfriend_want_you_back_through_text.pdfIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_d30cadd4176f4a2a832b7086a3021981.pdf?index=trueIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_18d72edf1054454faec48861dc39fb88.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001344c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1344C 20104 bytes
SHA-256: 2b03d6b3324236dc4e875f0ff7fa7174e8a68e0b7dbdb87cdcb6f758b5e05760
font_00_sfnt_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 5696 bytes
SHA-256: 25bed2e4a285d19bd14c4b65f0d4f7076af6bbdd34c4f2de143881cfff53cabe
font_01_sfnt_off000102fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 1940 bytes
SHA-256: 0aed2d680bff702d9e8c84c8781374ca951b3da029ec53ce83f3f466f4ef45ef
font_02_sfnt_off00010c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C30 11972 bytes
SHA-256: d0247d1ab794c02f4259c28774c92debd910e9d9f7340e58ac79b14918fa6944

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