Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4a182879c7e704…

MALICIOUS

PDF

91.5 KB Created: 2021-03-05 16:52:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4372cc82ab1b2d5f50cf159066a4fa84 SHA-1: ae32dd3d961f7f06597863890ddfbb82dc25efce SHA-256: 5b4a182879c7e7047dc53e60566f1baa04e8ebceb26ec2a7b6ce87e5e7082a66
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://xajibur.ru/strik?utm_term=good+sci+fi+books+for+adults PDF link annotation
    • http://amaryllis.space/should_you_run_a_dehumidifier_in_your_basement_in_the_winterkvkt5.pdfIn PDF document text
    • https://cdn.sqhk.co/gumoxixo/9gcicih/lalewawabunuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414488/normal_6004eeca33896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_5fe74de1becb4.pdfIn PDF document text
    • http://legiontry.online/christopher_hitchens_kissinger_youtubeksdak.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/what_is_network_and_types_of_network.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/hc52moO/can_you_escape_11_level_47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390373/normal_5fc7d99a8a7a0.pdfIn PDF document text
    • http://kvyovk.xyz/varifosetosib3mu.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/excel_vba_msgbox_no_prompt.pdfIn PDF document text
    • http://fapseo.ru/que_es_un_bucle_while_en_programacionid504.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/691d0e65-f077-4edf-8cfb-1c2745e962d9/xajid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0319f6a5-0628-40bb-a631-2a16485f89ea/bagolezoxojebasomikak.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_069cb25024474cccbbd498a18c5b8f83.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/99c05630-b6b6-40b5-a750-843c5b87e96d/tork_timer_wont_turn_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/742d3e24-8e87-4c64-9dc2-4f2a76b07fb6/90709777352.pdfIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_db06dc434fb445dab2090642f8cc76e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/817c3711-33f8-4d42-93bb-c07f607aa42a/duchess_of_malfi_act_2_scene_5_analysis.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_ce27f152e0b7429881f24d06a96ed222.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_off00012983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12983 5248 bytes
SHA-256: fe294d51640daf7468439f6bc530787e544216c00e41dbff35af9a813ad9f431
font_01_sfnt_off00013b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B72 11100 bytes
SHA-256: 1313f7ce8cc7ec4245051fe33f8b191c45721cb08779b3d41ea4a4c38956cc12

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