Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ac9971fd96e8c4…

MALICIOUS

PDF

84.7 KB Created: 2021-03-05 01:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 90b703c7d1828acfe7c1ad315fdb0c49 SHA-1: 73bdba311f38e90aabab9566c5b00d1486976650 SHA-256: f5ac9971fd96e8c434f118bf2a05e4e6e54a3b3237eb5002eabf87794285d075
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with several pointing to disposable hosting and identified as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute malicious content or phish users. No scripts were extracted, but the presence of external URIs is a primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=in+the+mood+glenn+miller+band PDF link annotation
    • http://rugozuravonabib.22web.org/abacus_6p_user_manual.pdfIn PDF document text
    • http://togusavek.22web.org/86245957722.pdfIn PDF document text
    • http://mukatadirez.iblogger.org/45303476966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_6031dcff4cd6d.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/uhcWgjY/web_design_for_small_business_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/2gecjgO/vitub.pdfIn PDF document text
    • https://cdn.sqhk.co/vojeruzujuzi/hid0ido/19079637443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479474/normal_5fd7f11347450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480893/normal_600942a32012d.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/hgYHzLr/vudozuzixu.pdfIn PDF document text
    • https://cdn.sqhk.co/nenakowi/xhhhihd/96463125323.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tokofelutuj.epizy.com/43479070784.pdfIn PDF document text
    • http://dobejul.epizy.com/autocad_blocks_stairs.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/libobari.pdfIn PDF document text
    • http://zurogukewujot.epizy.com/audiolibro_el_poder_del_pensamiento_positivo_parte_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e9318b-665b-4666-a47c-6d689c9dfb00/calendario_sep_2020_a_2021_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/79988502209.pdfIn PDF document text
    • http://kasisexa.rf.gd/36456084865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f8e7f01-a93d-4d84-95d5-10734311a6d5/21499101628.pdfIn PDF document text
    • http://wawutanow.epizy.com/nopefofuwupawurapadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba679639-7711-40b2-8a2b-02be7102708d/the_8th_habit_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/040d1eac-3b02-450b-b1cf-4f87eb8f2e35/rugekuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/046f7d6e-1f16-4811-9cb9-bcf0230c6c69/lukutemel.pdfIn PDF document text
    • http://jilejulo.epizy.com/37300540328.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_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 5140 bytes
SHA-256: 030a60f5d51da60fd7011e0446ac29682028221fe4bcf9380d63e9febf580a9a
font_01_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 10720 bytes
SHA-256: 25696c883ae890cf02e203124245579682b98e4944f68b9a2d49e24ba136488c

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