Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf61380f36d074c…

MALICIOUS

PDF

76.2 KB Created: 2021-03-30 22:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b936645e0f92bcf9e7b299e3cd24c854 SHA-1: 7d9b1be9916c953667397f79b9a6523a5e6279e8 SHA-256: 9bf61380f36d074c425272d3e0d11b2b3952f51ad45f6e7c9e6db5f834eed92e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

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://jumiwimov.ru/wix?keyword=biology+fall+final+exam+study+guide+answers
    • http://oneitshop.info/7527542159w08be.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://bbcua.site/77979551771lgfuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/03a3e1d3-d182-4654-b811-0dcfc89aa8ed/why_is_the_picture_on_my_samsung_tv_blurry.pdf
    • https://uploads.strikinglycdn.com/files/10869e51-6bd7-437c-90b0-a505336cefe3/kiparelumovusirisox.pdf
    • https://s3.amazonaws.com/zoxewudunigus/refuf.pdf
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_2233063cfd5a47cbb4ed1650d6d14a86.pdf?index=true
    • https://s3.amazonaws.com/luborinizu/62252045575.pdf
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_aaaa5bd9f4bc4dbcb1f8e344f6e96696.pdf?index=true
    • https://s3.amazonaws.com/gezetega/94220830456.pdf
    • https://uploads.strikinglycdn.com/files/527f2d35-8326-4b09-a6b0-eb36387a5031/97494827636.pdf
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_01bbe6c13532481b8ffa2023b7b690d2.pdf?index=true
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_d8c21316d9d042fb8763b1f80a04807b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/474e5925-af09-4dc8-9b79-ffa1f29b5269/how_do_you_make_a_glaze_for_a_baked_ham.pdf
    • https://s3.amazonaws.com/julexekubaj/mabezajewofebijekekogil.pdf
    • https://uploads.strikinglycdn.com/files/5862714f-1233-41c4-84e2-57b0405c151d/how_to_clean_a_whitfield_quest_pellet_stove.pdf
    • https://s3.amazonaws.com/vavapekadoliti/what_financial_questions_to_ask_before_marriage.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_off0000eb82.bin
7a2a2bbcee787e7def202f143e308fc71b77c444985c711cb158cf401fbc0b68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 5536 bytes
font_01_sfnt_off0000fe73.bin
5c5e6da5506e470635c3b7f509642e89a2f28363431e984f84f503cc86a9b324		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE73 10932 bytes

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