Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3f50a2debbf9a1…

MALICIOUS

PDF

160.9 KB Created: 2021-03-20 22:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 08a202c1bfb47a346d2ba12e2c906ab9 SHA-1: d7ef92d765126a5d40d5ba9dcd131950906312ff SHA-256: 0a3f50a2debbf9a1ed3329178ca40b376b2dd2a8a6dd4740584bd3b829f1d8a2
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 0.9988

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://leonvi.ru/123?utm_term=banco+santander+brasil+annual+report+2017 PDF link annotation
    • https://cdn.sqhk.co/sixatowitur/spha8JM/wutalutovuni.pdfIn PDF document text
    • https://cdn.sqhk.co/zisafebu/yLPhdXs/visoraxamuduxokenevesig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422912/normal_60503b633d2dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_601cc23c44542.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490757/normal_5fc8dca025e96.pdfIn PDF document text
    • https://cdn.sqhk.co/nafumozuwe/jhUhjij/20569777770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417523/normal_6020ccee2c741.pdfIn PDF document text
    • https://lirurarupo.weebly.com/uploads/1/3/4/7/134770738/4229910.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/FGgjs9h/bodegixobutem.pdfIn PDF document text
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/abd80.pdfIn PDF document text
    • https://sulezesolujoseg.weebly.com/uploads/1/3/1/4/131452841/aeb203a9e071f.pdfIn PDF document text
    • http://davebamonuzove.medianewsonline.com/h2o_mop_x5_elite_how_to_use.pdfIn PDF document text
    • http://kajipim.mypressonline.com/teleological_vs_deontological_approaches_to_ethics.pdfIn PDF document text
    • http://sizerasadaxer.mywebcommunity.org/wodigesob.pdfIn PDF document text
    • https://cdn.sqhk.co/salujokep/lgfIhfK/gubasabagigituvifujemizuf.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/gbhdjeV/corporate_ladder_jokes.pdfIn PDF document text
    • https://cdn.sqhk.co/nidimaru/ijgibji/mr_machine_knives.pdfIn PDF document text
    • https://cdn.sqhk.co/zevivovakok/X2IpifS/ridun.pdfIn PDF document text
    • http://xoxosedefoxadu.mygamesonline.org/use_of_the_fifo_cost_flow_assumption_means_that.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/nujilizelozudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470835/normal_6028edcb74000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419425/normal_6048a29fe4126.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/asus_xonar_dgx_sound_card_installing.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_off0002397e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2397E 5664 bytes
SHA-256: d72cac6131bb4f2fb4ec28cf3195c8ce759c06c5d7302752939df9778f460a63
font_01_sfnt_off00024cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24CD3 11588 bytes
SHA-256: e54495dad329a39db89ecef1d6448acbab7706c5ea30a27fb9e9959303ff09c0

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