Malicious PDF — malware analysis report

Static analysis result for SHA-256 690cc2449fd6cf02…

MALICIOUS

PDF

78.3 KB Created: 2021-04-12 21:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8e0b271a607da59a37358d43da5b5ade SHA-1: f0faf9a8309f028ed660b26a6a8b31aa33e30366 SHA-256: 690cc2449fd6cf02b2c9f760cb4c1b5a45cc24b22535bd184889e356edce0d76
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The presence of a URL with a 'utm_term' parameter suggests a phishing or marketing lure. ClamAV and ML heuristics confirm the malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=how+to+connect+dvd+player+to+dvr+cable+box PDF link annotation
    • http://jozebifovo.22web.org/academy_of_management_and_information_technology_bbsr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_605b22cbae1de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482854/normal_6023d02d9b09e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_5fd6e1635b1b2.pdfIn PDF document text
    • http://help-copyrighteamservice.com/ccna_routing_and_switching_2018dtcc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460680/normal_5fe0cdbb6f06f.pdfIn PDF document text
    • http://kismyketio.com/2017_toyota_rav4_owners_manualg84hj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_c05693bfdefe40d0a41dd6440f645b72.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_3a0fc9527b28428a8d2038d605dc912c.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_59b27e4d8ded4e8a9545ffce1742b66e.pdf?index=trueIn PDF document text
    • http://bunetexugefu.rf.gd/biblia_reina_valera_1960_letra_grande.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_fe66b06ebaa14751ac532ba4861e12f8.pdf?index=trueIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_7a74dc10e4ff4cc793a8822179fef538.pdf?index=trueIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_89e425e6b4c34361a8ab597d1a5c697a.pdf?index=trueIn PDF document text
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_1267f41b73c24174926aa550dd6d204c.pdf?index=trueIn PDF document text
    • http://pitepune.epizy.com/mathworksheets4kids_identifying_inequalities_answers.pdfIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_309f844aacf2433bb0bbea8e8c19cf83.pdf?index=trueIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_7245ea0747174f6888ca7534a005eb81.pdf?index=trueIn PDF document text
    • https://681956c7-2c57-495f-b996-d04b50c745b0.filesusr.com/ugd/907d98_0c9fb804074d46dcbf82898f449a64e1.pdf?index=trueIn PDF document text
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_db9bf5ec561f43728c21f56dc3d92da8.pdf?index=trueIn PDF document text
    • http://lekirajadu.epizy.com/wetimawokakevokuzidaxaxo.pdfIn PDF document text
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_863b129e2d0e481fab07c6d02c3b4223.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 5312 bytes
SHA-256: aedecf41d1545f2d427cac23ac548d8862785e19e896047fb845f9bcae21a28b
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 11072 bytes
SHA-256: ae1064eb1a803c7cc137f43e0fd1c182307d353180a4ed4a2e44700da0c4ec07