Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a522a2a174e51ea…

MALICIOUS

PDF

78.5 KB Created: 2021-02-26 01:09:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 275dd43be8f9883399289e3001a44e18 SHA-1: 5fe0ca9d413db1bd0b9127ee6286a437f06a213c SHA-256: 6a522a2a174e51ea310967e9e46374c90f534a0778ad9d099b7e5f0d8238dcee
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a critical alert for links to known malicious redirectors. The presence of numerous links, many on disposable hosting, indicates a link farm designed to redirect users to potentially harmful sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/123?utm_term=monk+and+the+riddle+chapter+summary In PDF document text
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5ff3d812d5b66.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/how_do_i_know_if_my_cpap_humidifier_is_working.pdfIn PDF document text
    • http://vetokikiw.22web.org/dulumunoronodokodep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458145/normal_5fd831f13a529.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/bsjjkY1/mobile_marketing_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_6031ee2cb8bbe.pdfIn PDF document text
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/xidili.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/how_to_turn_on_landice_treadmill.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ravurewabaku.epizy.com/rurewogus.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/nikipaduvenujasoxubulamuz.pdfIn PDF document text
    • http://furovival.rf.gd/8613769600.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/wiwoxijulesizej.pdfIn PDF document text
    • http://fipuxogililego.epizy.com/nitonujubatitapojajuge.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/42210275438.pdfIn PDF document text
    • http://retuguru.epizy.com/casio_ga_1000_4aer_manual.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_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 5484 bytes
SHA-256: a4eac9c56d12ddc38b3e8e71673a3c18d98b325bc6e87cd6000eccb7b5f0a575
font_01_sfnt_off00010925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10925 10332 bytes
SHA-256: 7a208a7582e79b58932c899364974df29c2177e2571ae0dd2f0bf992c6b7eafd

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