Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3278f797b709f4…

MALICIOUS

PDF

78.7 KB Created: 2021-04-06 10:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ba135611fb66638a2cb473c932d370d9 SHA-1: cb76feffb45b7a1d4e74118cfa48673b24da2db5 SHA-256: ac3278f797b709f46883ccfedfb85bffe85b2635e533c96dff5b0c852c6b17d4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or conducting phishing. The document body, though heavily obfuscated, contains keywords related to SAT preparation, which is used as a pretext to drive users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://xezojetit.ru/award?keyword=barron+s+new+sat+writing+workbook+pdf PDF link annotation
    • http://bestunew.xyz/ford_econoline_repairotd71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_5fe8f963b0927.pdfIn PDF document text
    • https://fewojejano.weebly.com/uploads/1/3/4/3/134348079/9395135.pdfIn PDF document text
    • http://mandarins.space/889688606764qiut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426822/normal_6039cc3526abd.pdfIn PDF document text
    • https://cdn.sqhk.co/texonatuzi/cEjHNMq/clay_pot_decoration_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/hcgegiE/funny_climbers_quote.pdfIn PDF document text
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/177d48998505.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494146/normal_5fe24ab6bb1be.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/gjBibvw/tujuwotutat.pdfIn PDF document text
    • https://cdn.sqhk.co/vetelovube/ifjciiJ/book_folding_art_template.pdfIn PDF document text
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/bovasekut.pdfIn PDF document text
    • https://cdn.sqhk.co/fagisuxupinu/2uhjij9/flipper_fair_pinball_machine.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/what_are_dynamic_tension_exercises4oz4h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378846/normal_6008b839cd587.pdfIn PDF document text
    • https://gabanifuvumot.weebly.com/uploads/1/3/4/5/134588994/jibaf-xaxexezis-vubelaket-rezuxemawami.pdfIn PDF document text
    • https://bimomudunaxa.weebly.com/uploads/1/3/4/7/134757379/7722461.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa84d2ba-6844-43d1-ad2a-7d61e20f0b1a/wegekawamitanive.pdfIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_5cc633ef77804a9aa6309fe370d95d6c.pdf?index=trueIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_52b8d74fdce94b8fb9f032539ccb5ff6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92150df5-2c1e-4a06-8b31-94ee375c92aa/tablet_lg_g_pad_iii_10.1_fhd_4g_lte.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a4f464-c8ad-48f3-85e8-137d7089fa48/wetuvosovolamijezew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b15740cd-d7ca-4c16-b630-da6a1bc6842c/wizubipo.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_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 5524 bytes
SHA-256: cc254d1d000d8eeed7ccbb1a66e21535f3b75e908d70185bf1818c22d0e0df54
font_01_sfnt_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 11200 bytes
SHA-256: cb4389670219dfa02fcc05f4f508891f9e8ffd7bf97fa88077421aa3ab195cd1

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