Malicious PDF — malware analysis report

Static analysis result for SHA-256 490e12b4f4c4481a…

MALICIOUS

PDF

76.9 KB Created: 2021-03-15 20:50:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc964395c327db02c2594c33fb031873 SHA-1: da36b00dfed2d2ec9c322c0b7efed5482c3998a5 SHA-256: 490e12b4f4c4481ae0053a736be338a50388f34497cfd4bb84dfa5a17faf7c0b
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier with high confidence. It contains a significant number of external links, suggesting a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://resalured.ru/aws?utm_term=how+do+you+get+lean+certified
    • https://cdn.sqhk.co/detaludolef/gjZidii/logo_quiz_answers_level_12_android.pdf
    • https://cdn.sqhk.co/durotula/jjgi5jf/leo_dictionary_german_romanian.pdf
    • https://cdn-cms.f-static.net/uploads/4421062/normal_604b15832a4f2.pdf
    • https://cdn-cms.f-static.net/uploads/4423148/normal_602fba41a36c1.pdf
    • https://cdn-cms.f-static.net/uploads/4490371/normal_5fd25799e39e1.pdf
    • https://cdn.sqhk.co/naketego/cZOjdhd/54680753514.pdf
    • https://cdn.sqhk.co/kibutonap/hfWhiEd/misamawedelovelubux.pdf
    • https://cdn.sqhk.co/mebereserab/ZO8Wqhc/axiforma_semibold_free.pdf
    • https://cdn-cms.f-static.net/uploads/4486213/normal_5fe64690734ad.pdf
    • https://cdn.sqhk.co/zepigelona/IeOhfjj/xokoxilixe.pdf
    • https://cdn.sqhk.co/fuvebopeweb/hbigrha/degadavonamixiwi.pdf
    • https://static.s123-cdn-static.com/uploads/4411001/normal_6002e73d98ab3.pdf
    • https://cdn.sqhk.co/noxisoture/g1WhdNF/server_2019_routing_and_remote_access.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/golepe/jugar_ajedrez_online_android.pdf
    • https://s3.amazonaws.com/pafexegud/sample_liquidation_report_deped.pdf
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_68881d44342346c49aba1f922195be9d.pdf?index=true
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_293aace35e834838b40cdedae19b7fd6.pdf?index=true
    • https://s3.amazonaws.com/vuterijoze/what_is_the_most_powerful_weapon_in_norse_mythology.pdf
    • https://s3.amazonaws.com/kasuwevovog/82574215836.pdf
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_b090e3dd7b5f4c028d62f840ccbcca0b.pdf?index=true
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_0af5fae5fc304e069c018fb5d4a4180c.pdf?index=true
    • 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_off0000ef59.bin
79e486ae00adb861be1896012ffd648ba811499c90f17b33ed9a44d1e501ca38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 5164 bytes
font_01_sfnt_off00010111.bin
c223bd39817f69a99325e6baf2399a857865b7d3f121688a544bf86ec2bd55c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 11052 bytes

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