Malicious PDF — malware analysis report

Static analysis result for SHA-256 4770ce532d1c04ff…

MALICIOUS

PDF

85.4 KB Created: 2021-03-16 12:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 647cd4e4d8cdd42e0683ba2ef53ad387 SHA-1: b65cec6eeff088a03eb497642478d300a08fbda1 SHA-256: 4770ce532d1c04ffe361eeaaa653d4c0592986a1a1033d4a280fe4e97e8b05e7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://pelibifir.ru/123?utm_term=properties+form+html, which is likely used to redirect users to further malicious sites or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://pelibifir.ru/123?utm_term=properties+form+html
    • http://capridigi.com/15359535242dqyas.pdf
    • http://dizurexemubegog.mygamesonline.org/63835041002.pdf
    • http://pigigozoruda.mypressonline.com/how_to_connect_vizio_sound_bar_to_sub.pdf
    • http://manidat.sportsontheweb.net/reported_speech_questions_test.pdf
    • http://mopexaxurip.getenjoyment.net/towafoken.pdf
    • http://digitalliteracyinstitute.com/tifa_fell_how_to_get_back_upt0veu.pdf
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/desabigunabugznoh.pdf
    • http://damvglaz0.xyz/do_marines_get_paid_while_in_boot_campgjqp8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_8f04cea402fa42bfb139b1e6b34db654.pdf?index=true
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_9fb480e9c4054306b148208c4aae004b.pdf?index=true
    • https://s3.amazonaws.com/siwixomudit/68550355234.pdf
    • https://s3.amazonaws.com/gotenukevepunin/lake_eufaula_fishing_report.pdf
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_3267d598a2304600ae63468fd2411bb3.pdf?index=true
    • https://s3.amazonaws.com/tojabixefova/26436813855.pdf
    • https://s3.amazonaws.com/lejivugeleguwod/genetic_engineering_exam_questions_and_answers.pdf
    • https://s3.amazonaws.com/suximawo/93290805100.pdf
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_25281964a8274ee8b0a232bb3f2d2d5c.pdf?index=true
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_3f044905e2ab4ae3b421c61f5e8ba826.pdf?index=true
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_7824fc71f6904d83b6f2590f3a2628a4.pdf?index=true
    • https://s3.amazonaws.com/dogazisuze/africa_unite_song_by_tb_joshua.pdf
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_69b79fa48dfa4dc28fc25275f4fffa5e.pdf?index=true
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_b5ae45f7813a4daf9cc6133641767b8d.pdf?index=true
    • https://s3.amazonaws.com/tiduro/solving_rational_equations_and_inequalities_worksheet.pdf
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_8575174317f245fabf85dcbc59507e34.pdf?index=true
    • https://s3.amazonaws.com/netinuwa/halo_wallpaper_4k_android.pdf
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_7685667bdf6a4c0c862a160712b3323d.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_off000110fe.bin
80760054b66ff201aceb132f86ca39b5b440382ebbedaf623db5d528dc0e2880		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110FE 4932 bytes
font_01_sfnt_off0001219e.bin
de1cb11d4444246cfa1dd670f7f1dd868d5a8cf9934d0f329a5d53a49776b765		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1219E 11048 bytes

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