Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e139178ba6bb938…

MALICIOUS

PDF

76.3 KB Created: 2021-05-02 23:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7b68f0da724146321f136c47c1cdeb45 SHA-1: 06c568c72f67eb4cb4acd360e56ac46d08a93395 SHA-256: 1e139178ba6bb938d3df5ddcf7a7fa2ad9d61fe4fb0013d196a88a43c2a3f906
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or spamming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document.

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://soxebez.ru/strik?utm_term=learn+calligraphy+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470837/normal_606447e6a76ad.pdfIn PDF document text
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/levekubomepevi.pdfIn PDF document text
    • http://dabinepoj.mygamesonline.org/tusipefotulivor.pdfIn PDF document text
    • http://dkblogin-de.com/oleary_plaque_index_calculationxo3t2.pdfIn PDF document text
    • http://pifedalune.medianewsonline.com/past_tense_and_present_tense_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_6055b1a720a81.pdfIn PDF document text
    • http://uptodate.site/58651718454j80ad.pdfIn PDF document text
    • http://hugertely.xyz/warojisojevilemepab25h9.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/priere_pour_attirer_la_chance_et_l_argent.pdfIn PDF document text
    • http://badge-verification-center.com/83183900791siuwy.pdfIn PDF document text
    • http://procripton.com/guvilewajatppk8q.pdfIn PDF document text
    • https://mezovojexojija.weebly.com/uploads/1/3/0/8/130874002/74a88ebe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fusozevukatamir.atwebpages.com/difference_between_acronym_and_abbreviation.pdfIn PDF document text
    • http://tonorepunad.myartsonline.com/healthy_smoothie_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0016e2da-d53d-4767-9e8b-7bba2a86c4dc/stained_glass_window_math_worksheet_answers.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/44500266970.pdfIn PDF document text
    • http://sinusisokopex.atwebpages.com/what_does_the_phrase_well_wishes_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/576e1755-7b8f-4b74-a827-0054af3148bb/44187834918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/753840a4-e308-4813-853c-37436586b445/meade_telescope_accessories_electronic_eyepiece_07165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8186ec74-6030-4c11-84f3-9e08ae160e4c/how_to_join_the_royal_army_medical_corps.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_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 5284 bytes
SHA-256: 58d9496326e6052c8d80e521ec615892e4d6db1601fbe897bf6351fd1a8281db
font_01_sfnt_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 11508 bytes
SHA-256: 63b6cfc0beacadd612e7acc21b7e169cdc0bb15b2153d9107b6ed8b9f94227f8

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