Malicious PDF — malware analysis report

Static analysis result for SHA-256 6accd64d6bc9ffd6…

MALICIOUS

PDF

101.1 KB Created: 2021-03-15 02:33:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 76c1ae3f0dc3897a906c15f3e09edfbd SHA-1: 9518d88b0cfa1e7021cb51203675868b6adff56c SHA-256: 6accd64d6bc9ffd6ab7c439297cc6a90b773807b2fafdb462de6b05d015378d4
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=bacterias+patogenas+en+coprocultivo+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4410207/normal_5ffcf0597bda0.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/dgj86tG/6760556106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_601be058214f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_6026666846fac.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/43470109253k0wmu.pdfIn PDF document text
    • http://sewonmedix.ru/letter_of_complaint_block_style_format8k3vk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_604761b0353c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_600addc2dd57a.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/ZUhigig/lazuf.pdfIn PDF document text
    • http://vuxijagodoku.22web.org/how_to_set_volume_limit_on_kindle_fire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467027/normal_5fd639927caa3.pdfIn PDF document text
    • https://cdn.sqhk.co/xifinelire/jjhacjh/teachers_union_tenure_california.pdfIn PDF document text
    • http://junelizirigoroj.iblogger.org/ls2_bluetooth_helmet_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470412/normal_603c4152967a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_6031970a0ccde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488855/normal_6008955ec910d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384152/normal_5fcd82afe1d8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420906/normal_600df727c473e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_6013c9b03f147.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nolonogatifotop.epizy.com/44455846495.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5B 5312 bytes
SHA-256: 4ec4fe60efd3e9d84570880d9118e1e990690bbb5dfc9772d08fc3b03fb163fa
font_01_sfnt_off00014e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E7B 12496 bytes
SHA-256: 04353aab98444096904d2abc05f5e54ff96df044a36664b4f741edf1f53aec71
font_02_sfnt_off000176ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176EE 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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