Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8cd381f7be2a38…

MALICIOUS

PDF

76.0 KB Created: 2021-03-28 21:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 39ce786be714b23c3195cfeb57badeaf SHA-1: 2303a17c48aec4fada1c667786710864076170bc SHA-256: aa8cd381f7be2a38db382d48b3e456cb7f23d6bf0b1e5126a9934667a849b56a
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 0.9996

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://jumiwimov.ru/123?utm_term=examples+of+collective+nouns+pdf PDF link annotation
    • http://mevixonur.mywebcommunity.org/new_headway_beginner_teacher_s_book.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/vopumaxuxifedejafof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488592/normal_5fe30cae410e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5fff0b9515b3b.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/RIwiajg/orc_village_quest_ragnarok_mobile.pdfIn PDF document text
    • https://kowenijog.weebly.com/uploads/1/3/4/0/134096242/47513079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466659/normal_604c9bcfae261.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/jOjmjaj/soccer_backflip_penalty_kick_goal.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/blessed_assurance_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/geWOFgg/simple_model_release_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369313/normal_5ff1880bdad69.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/I7fjaIn/chocolate_raspberry_cake_recipe_easy.pdfIn PDF document text
    • https://newewakezodem.weebly.com/uploads/1/3/4/6/134680802/lizurapudiraf_fukaxipufevu.pdfIn PDF document text
    • https://mizavuzozubex.weebly.com/uploads/1/3/4/7/134730625/jigabimigofi.pdfIn PDF document text
    • https://wenudujajavu.weebly.com/uploads/1/3/5/3/135318124/b76601171b7a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385417/normal_603b7e2e900f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_ef6efe97655c439590ab690973551ec9.pdf?index=trueIn PDF document text
    • http://fapugemuxo.epizy.com/denimesilaladijixevajutof.pdfIn PDF document text
    • http://xanijidul.epizy.com/culinary_uniform_stores_near_me.pdfIn PDF document text
    • http://gezojetisab.epizy.com/94294425351.pdfIn PDF document text
    • http://zaberosem.rf.gd/14405080655.pdfIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_8bae8c25e01a45359cb078f5aea4a50f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 5292 bytes
SHA-256: 3a4f50c473799e9b2b7643ba8dd35569bdc070a9112c8513f2786b47ae0dfa5d
font_01_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 10720 bytes
SHA-256: f394897af23836a513aceda325561e38714b77107a333776b7fe59ba126ebb6c

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