Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bd4a85fff93d57…

MALICIOUS

PDF

80.8 KB Created: 2021-04-02 22:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c2aa4d1e38068eebab88dee904788f8e SHA-1: 245862f0b6412dd47c1237296456a31335c75cfc SHA-256: a9bd4a85fff93d57748186e38479273f844b795914c3829ebb72911e2afddb8d
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=reglas+de+pronunciacion+de+los+verbos+regulares+en+ingles+pdf In PDF document text
    • http://toxusuzom.mypressonline.com/pikumigozazofoz.pdfIn PDF document text
    • http://copyright-help-report.com/umrah_guide_book_in_urduc8a1n.pdfIn PDF document text
    • http://kimokabif.medianewsonline.com/wotilelepatupajaruxowi.pdfIn PDF document text
    • http://rte-ita.fun/undeleter_apk_pro_crackedmx9yn.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/34295246403.pdfIn PDF document text
    • http://cetapp.xyz/bofinolezaruxuxuvovetep7c78.pdfIn PDF document text
    • http://uuuuull.space/budget_speech_2019_malaysiarpvz1.pdfIn PDF document text
    • http://khareedforosh.com/tips_for_reducing_anxiety_public_speakingn3h5h.pdfIn PDF document text
    • http://vorgazme.com/153073168552lzy2.pdfIn PDF document text
    • http://it50off.pro/midakabatunonizeximi4i2xv.pdfIn PDF document text
    • http://kadanijojabuf.mywebcommunity.org/story_in_simple_past_tense.pdfIn PDF document text
    • http://relodifalixogo.scienceontheweb.net/49766088565.pdfIn PDF document text
    • http://mudixefibewab.mywebcommunity.org/13483691820.pdfIn PDF document text
    • http://feludekinopotas.scienceontheweb.net/les_accords_jazz_guitare.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pidodexogejax.myartsonline.com/elements_and_principles_of_design_in_fashion_powerpoint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74148440-2ac1-478f-9c64-08b97c0a7804/tojuworakapirilezavag.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/53919721831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8e3e9e-1d69-487b-9329-b712c0e9de4e/what_are_the_different_sexualities_flags.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/pizen.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/dovobazotazeluguzixerarax.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/kumuruvunowej.pdfIn 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_off0000f7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 5528 bytes
SHA-256: 407a83bb6850da7738faab778d5188b2c98a201ee1739147f269dbdd582a258f
font_01_sfnt_off00010ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC7 12432 bytes
SHA-256: 0779231e02fabe517e88ca89338419943998ff206213394158472f3dd86cf005

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