Malicious PDF — malware analysis report

Static analysis result for SHA-256 176825d96ac56a09…

MALICIOUS

PDF

76.6 KB Created: 2021-03-20 06:10:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: be2127ddb302ab1bf0cad282629d861a SHA-1: 54940a3283c8624f5e67c257c5bf91ff7e04ff3f SHA-256: 176825d96ac56a0980ca2dae44a6933b618f20d3fd2611417abdb3c06980279a
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 SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://ponafet.ru/wix?keyword=integers+and+the+coordinate+plane+worksheet PDF link annotation
    • https://cdn.sqhk.co/gixedomawa/ohejcib/81068145965.pdfIn PDF document text
    • http://xapepinozex.22web.org/envision_math_grade_3_answer_key.pdfIn PDF document text
    • http://jofufuzutaki.22web.org/samsonite_luggage_size_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/Gif1ukM/majoritarian_politics_definition_government.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/5Zvjjhj/sebajadaluduwipukefivimuk.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/eeG6yFU/2575860293.pdfIn PDF document text
    • http://kenujuzuba.22web.org/how_much_do_wheelchair_lifts_cost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sobumewupuvuve.epizy.com/badexijumadiguvilovabamub.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_1a481a07c1cf4b7aa35f4e28a155b901.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ad6fe5-3506-4171-b53c-da786cea98e7/is_there_a_2nd_fifth_wave_movie.pdfIn PDF document text
    • http://zasefewesawutam.epizy.com/9835099940.pdfIn PDF document text
    • http://mavuginogafesu.epizy.com/sunbeam_heated_blanket_blinking_red_on_high.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca9cefb-9234-4706-ad97-c58279ca3208/bill_nye_states_of_matter_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c0a3b5d-7114-453d-9ffe-318f6d0c5960/47567624941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b896ae3-861e-472e-9aa5-5f80775df198/24343232807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15548cb-af7b-4df3-8f65-4823b8a64b01/what_is_atomic_mass_number_of_oxygen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b03a613-feaa-4506-9cfa-60c0cd658489/3614142337.pdfIn PDF document text
    • http://nonomajemiw.rf.gd/how_to_start_studying_for_real_estate_license.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_5f29b1240e434647b10a6f89d25c98b8.pdf?index=trueIn PDF document text
    • http://gerufufa.epizy.com/danujozide.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_fa80b2cc97204ece88891cf493ded197.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60da02ea-edec-4634-8e76-d479e69adb01/libukob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb4582e-564b-40af-9d5f-f5b5c78a15c6/62180450487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9755237c-9f1c-4892-a2bb-3f17d12af53d/calcular_area_do_triangulo_geometria_analitica.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 5216 bytes
SHA-256: 219d0d3a38f32519edb5abb663e9af1f9cc4f720c10aa0f4f9da12bb330eb9ca
font_01_sfnt_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 10512 bytes
SHA-256: c623a16b23fb9663514414948733fe9a7d2559142a6cb81bd1e5774aa6f7e588
font_02_sfnt_off000116a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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