Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e6b16ecc8e0461…

MALICIOUS

PDF

71.2 KB Created: 2021-02-20 13:24:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 939977284f6d2c42ddfcb4288e3babd3 SHA-1: 11532facf7c341cb6276eb0fc63829a91e91ec7d SHA-256: f5e6b16ecc8e0461dd50ead4ce06005d53cb6b99f61a3b6780a1d9927499c78c
186 Risk Score

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=using+proofreading+marks+worksheet PDF link annotation
    • https://tetoxoji.weebly.com/uploads/1/3/0/9/130969306/laxozikuzusuke.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/nijatonejix.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/Nij2gBv/sprint_my_account_pay_bill.pdfIn PDF document text
    • https://mirurilusenut.weebly.com/uploads/1/3/4/6/134631679/5297774.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/edadc7f1.pdfIn PDF document text
    • http://yoga-fitness.space/noxious_weeds_of_australia41pr7.pdfIn PDF document text
    • https://cdn.sqhk.co/kipasewimoni/ejehcgf/basketball_free_throw_drills.pdfIn PDF document text
    • http://damvglaz1.xyz/81766875851gh48q.pdfIn PDF document text
    • https://mofagobebaz.weebly.com/uploads/1/3/4/6/134633285/3978344.pdfIn PDF document text
    • https://revasarubon.weebly.com/uploads/1/3/5/2/135295272/5638609.pdfIn PDF document text
    • https://gumomerad.weebly.com/uploads/1/3/1/8/131856086/5259827.pdfIn PDF document text
    • https://vipegiwofavagob.weebly.com/uploads/1/3/5/3/135302795/tozireri.pdfIn PDF document text
    • https://mejonozawus.weebly.com/uploads/1/3/4/0/134016798/3681320.pdfIn PDF document text
    • https://supimoxu.weebly.com/uploads/1/3/5/3/135319300/xunegulobox.pdfIn PDF document text
    • https://zofazozudu.weebly.com/uploads/1/3/0/7/130739697/farab_wofokagovo_fudefamilewo.pdfIn PDF document text
    • https://safopuxe.weebly.com/uploads/1/3/4/8/134893808/lusenexava_vafanerofupive.pdfIn PDF document text
    • http://lovemecompletely.com/what_neutralizes_pet_urinexfboj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fizup/44857474360.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/fusiganavi.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/canon_eos_70d_utility_software.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_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 5568 bytes
SHA-256: 37aebc9ff5cdd79a405e5756c9e1dc5bcc1846c58c06acac9dc455d9cc61203a
font_01_sfnt_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 10724 bytes
SHA-256: d43dcf2e926f25350dc492765175e99b5aa4774aec841d4e429934adc6a10e09

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