Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a64f7d7d0c4a12…

MALICIOUS

PDF

76.7 KB Created: 2021-03-18 13:30:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a7153f9168e087b366da538bd3e2bc4 SHA-1: 73786eec281e2b76990a1ccf6a98a3f3e170327b SHA-256: 44a64f7d7d0c4a12d818e97c157091cb7e4d5e93be1ce544e8f1bc4346bbd03c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'The Conjuring 3' trailer. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=the+conjuring+3+2020+trailer
    • https://nezikuwetop.weebly.com/uploads/1/3/5/3/135346993/nikikif_gaxanimijufomos_jurosifukuwomi.pdf
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/432ca710fdc6.pdf
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5fd27d694edd6.pdf
    • https://kererivodukeje.weebly.com/uploads/1/3/5/3/135303009/xijaduzasugu.pdf
    • https://cdn-cms.f-static.net/uploads/4393193/normal_602774f1c2825.pdf
    • https://pobejatu.weebly.com/uploads/1/3/2/7/132741278/957119.pdf
    • https://cdn-cms.f-static.net/uploads/4371514/normal_60366c091c703.pdf
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/wuzinisimeg_jerajakulolijod_robuso_tejos.pdf
    • https://cdn.sqhk.co/neliwuwo/giUsWRR/fijedofosupizi.pdf
    • https://cdn-cms.f-static.net/uploads/4368244/normal_601e2806940f7.pdf
    • https://static.s123-cdn-static.com/uploads/4487416/normal_5ffdfd21d6644.pdf
    • https://cdn.sqhk.co/ligumorik/Qiihdhj/74064021499.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/91a1e046-89b0-45e9-864f-86f629492732/mortal_instruments_film_vs_series.pdf
    • https://uploads.strikinglycdn.com/files/473fba66-b8ff-4ff0-b511-a04a20375ff4/how_to_reset_westell_7500_router.pdf
    • https://uploads.strikinglycdn.com/files/fac2e0fb-dd06-4e5e-a55f-cff764c710a8/55893194100.pdf
    • https://uploads.strikinglycdn.com/files/f98cba1f-330a-4b26-827a-43cd5d44f98e/nutetunesoxow.pdf
    • https://uploads.strikinglycdn.com/files/a79f8195-9e6b-4de9-b097-74ddfb0a1f96/how_to_write_a_scholarship_essay_about_yourself.pdf
    • https://uploads.strikinglycdn.com/files/4120a80e-5b3c-4a18-bd51-df146a912735/jebisuk.pdf
    • https://uploads.strikinglycdn.com/files/4bb509b9-f553-4ab8-8a00-87e32e242e22/81688446822.pdf
    • https://uploads.strikinglycdn.com/files/175ebcd9-b6ea-4a67-99eb-4a01426cee02/farberware_air_fryer_toaster_oven_fried_chicken.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed72.bin
5ea75729941418caaa25fa0d173125e140eca53728d1999e5258c2360b95bb4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 5348 bytes
font_01_sfnt_off0000ffa3.bin
c0f3bbd7b8e3f0c37552182376455bae21b35b44c4cc3cbb52f65d45944940b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 11000 bytes

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