Malicious PDF — malware analysis report

Static analysis result for SHA-256 990ae89d9f04fbf2…

MALICIOUS

PDF

74.4 KB Created: 2021-03-10 21:28:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 126035187bdbf61acd63938f6abec568 SHA-1: dc92d6e6f7c3c6cb9a35d08e4aded15aa117b6ba SHA-256: 990ae89d9f04fbf2e60bd33448b9f467c135f6b5a0a527ab9b6fe0f8ec73fbac
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=oxford+dictionary+english+to+tamil+pdf
    • https://domisupufiz.weebly.com/uploads/1/3/5/3/135316273/kuxul.pdf
    • https://xurarasetar.weebly.com/uploads/1/3/4/0/134096945/fokowivo.pdf
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/2929920.pdf
    • https://gipazekafasulal.weebly.com/uploads/1/3/4/6/134600210/4211809.pdf
    • https://sowidokobixu.weebly.com/uploads/1/3/1/8/131856306/27251.pdf
    • https://cdn-cms.f-static.net/uploads/4482619/normal_602ec724afd19.pdf
    • https://zivixitusinuz.weebly.com/uploads/1/3/1/3/131380786/dudosaboninax_pepedubasip_betumusotoz_wetevakanuxade.pdf
    • https://static.s123-cdn-static.com/uploads/4409627/normal_5fcdb71790fca.pdf
    • https://mibubibot.weebly.com/uploads/1/3/1/8/131871690/ec591.pdf
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/zepexuli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/gelawiweza/snapper_rear_engine_lawn_mower_parts.pdf
    • https://s3.amazonaws.com/begijufadi/how_to_fill_nigeria_airforce_form.pdf
    • https://uploads.strikinglycdn.com/files/f5ef0b4c-118a-422d-ba73-f01009dac1d6/family_portrait_photography_tips_and_tricks.pdf
    • https://uploads.strikinglycdn.com/files/3fbe824e-aa02-40cf-a99f-4d7d1f698fbe/sony_receiver_str-dg520_manual.pdf
    • https://uploads.strikinglycdn.com/files/6af8eabe-d376-45db-a195-e94563dabadb/how_to_make_emp_slot_machine_jammer.pdf
    • https://uploads.strikinglycdn.com/files/c7a655db-bf5f-40ae-be19-9538d3332739/miluxereluxazubalawuneku.pdf
    • https://s3.amazonaws.com/zetubakuz/pulejoxamuvutofemapafa.pdf
    • https://uploads.strikinglycdn.com/files/691c0baf-37dc-477e-a81b-d7406db6b9e0/wumibopugameta.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d796.bin
d37f72a3c93e3b643b34e489d2844f49644121daa0627111fa281ea194d39a96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 5764 bytes
font_01_sfnt_off0000eb19.bin
ea990a49b32eb55f692d1534ca870e9be96abac07807c28f2208a3e1b4194523		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB19 3620 bytes
font_02_sfnt_off0000f93a.bin
875ad7f1e7f82220b6cf098637aa10b3c2e8a0d6207f67d47fc32aa3c1036229		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 10244 bytes

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