Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d4a5d7cfb975a1…

MALICIOUS

PDF

78.0 KB Created: 2021-03-08 12:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c177dcf09d740eb7846edea38bdf955a SHA-1: 0198d640c203ffa0347108dfe8d21b544e514e82 SHA-256: 67d4a5d7cfb975a1635ba15a3729556c4622e5b5e06ffa6a347d4665f44e4b37
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=what+are+some+of+the+positive+feelings+you+have+about+yourself PDF link annotation
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/2078118.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408461/normal_6001048a7d123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481275/normal_603448d768720.pdfIn PDF document text
    • https://pawigesi.weebly.com/uploads/1/3/5/3/135389203/88fa500f4.pdfIn PDF document text
    • http://pililiriniru.mypressonline.com/fipofokofaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_603e368cb121d.pdfIn PDF document text
    • https://lazogipinu.weebly.com/uploads/1/3/1/0/131069887/b3ba9b948c3b2.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/0fb848b6.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/maytag_bravos_washer_error_codes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470545/normal_602b80845fa66.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://pakilapawunafep.epizy.com/songwriting_for_beginners_book.pdfIn PDF document text
    • http://saziwujezad.epizy.com/accommodation_form_student_information_ielts_listening_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/vuvis.pdfIn PDF document text
    • http://bepebujefu.rf.gd/58593157112.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/wugozenekopu.pdfIn PDF document text
    • http://bozudob.epizy.com/lajinupusizerupiruz.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_f1e9adebc75a412fb3f4084cf6b0cfdf.pdf?index=trueIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_c4de52c55bd0487fbf81d8e4d426c070.pdf?index=trueIn 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_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 5512 bytes
SHA-256: a26514493d745cebb4583e067622351a1d8c43664706dcf3b70b369f99accad2
font_01_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 10220 bytes
SHA-256: b9e3eef78c039db8a266a1089fe234c7eff41e0b1141b87884b9a896d6d1c3a4
font_02_sfnt_off00011c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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