Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8363e8e8cb6ad29…

MALICIOUS

PDF

73.5 KB Created: 2021-06-05 02:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 673855575da5257d233c74eb7073b072 SHA-1: 69c1c9c490fcd3a9bec7768c7e96193b638c45e6 SHA-256: d8363e8e8cb6ad296fa3640141c94a265681f3f37ace78806129a78921fa5199
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM', directing users to various websites, including 'https://crewmak.ru/pbw?utm_term=biblia+de+jerusalen+nueva+edicion+totalmente+revisada+pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or spam distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://crewmak.ru/pbw?utm_term=biblia+de+jerusalen+nueva+edicion+totalmente+revisada+pdf
    • https://bogonifad.weebly.com/uploads/1/3/4/1/134108647/7949143.pdf
    • https://leluwimatuw.weebly.com/uploads/1/3/0/9/130969986/sudafemub.pdf
    • https://rojujajaz.weebly.com/uploads/1/3/4/7/134727345/8852498.pdf
    • https://pemogele.weebly.com/uploads/1/3/5/3/135324676/6240358.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/030e99e5-dcfd-4ebe-b804-bc9ff4b63d51/dobomatajalaz.pdf
    • https://uploads.strikinglycdn.com/files/e8831cfe-c00e-4973-92ca-c27d118ff5ae/30136634170.pdf
    • https://uploads.strikinglycdn.com/files/34723536-2f62-451f-bc03-1182a9c18c9b/what_is_a_gullet_stick_for_dogs.pdf
    • https://uploads.strikinglycdn.com/files/91da3c91-f146-4ddf-b4ca-cc0adb7820a6/mksap_17_nephrology_free_download.pdf
    • https://uploads.strikinglycdn.com/files/a203b6bd-449f-496a-88de-467924b586f5/67471884772.pdf
    • https://uploads.strikinglycdn.com/files/552ebe7d-be4e-4133-9a43-77d057f27210/what_is_a_scofield_bible.pdf
    • https://uploads.strikinglycdn.com/files/721abbfc-63bf-400a-bc6c-3367904dfda7/xejurodudupow.pdf
    • https://uploads.strikinglycdn.com/files/45e84753-e44b-4c11-ae96-03b9a775f2b3/funasazumibar.pdf
    • https://uploads.strikinglycdn.com/files/03a6bbd8-aad3-4eef-bc0b-2c351d3229a7/mercury_marine_outboard_parts_near_me.pdf
    • https://uploads.strikinglycdn.com/files/4ceb870d-a690-48f2-a90d-6c662b9fbcc2/19185815747.pdf
    • https://uploads.strikinglycdn.com/files/f9b1635b-ed63-4d9f-bc85-9eec0a91fee7/rirutelodibosasof.pdf
    • https://uploads.strikinglycdn.com/files/84869434-dd3d-41cd-b283-0df853aa6681/nijubedet.pdf
    • https://uploads.strikinglycdn.com/files/8f7c759b-85b8-4b20-86df-d3a1af65c4e2/jaxerasolosop.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_off0000dd32.bin
a3eb56a0825d8ff2e9c560bae646cb367b8b5b701c801a8df01d406d4fd7e41b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 5628 bytes
font_01_sfnt_off0000f049.bin
c23812b734688e52b241485232e23196b64bb364e7da41e32fafb6f9dc9f70c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 11772 bytes

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