Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4ba78ca335e8c4…

MALICIOUS

PDF

82.9 KB Created: 2021-04-03 00:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c162caca33138dc7df8aa74e10cad912 SHA-1: 18e99b856d115663dd30489be5baa2ae83fe9b8c SHA-256: 5c4ba78ca335e8c42c514ec2d6bec75eac4342f519d016772cecff1d826118d3
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/strik?utm_term=how+to+use+fraction+strips+to+add+fractions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478927/normal_60353f8fa3b3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501383/normal_602e0ec125e4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455639/normal_5fcd328a50b67.pdfIn PDF document text
    • https://cdn.sqhk.co/nadudegimew/3xehj9Y/girlfriends_guide_to_divorce_season_3_soundtrack.pdfIn PDF document text
    • http://dexofuzexolan.22web.org/genie_excelerator_ii_programming.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407086/normal_601691fdaf16b.pdfIn PDF document text
    • https://zonozedu.weebly.com/uploads/1/3/0/8/130874021/rufizibo-refibot.pdfIn PDF document text
    • https://cdn.sqhk.co/gonuromabime/gjebOje/tiktok_download_anti_ban.pdfIn PDF document text
    • https://jomokojexenubi.weebly.com/uploads/1/3/4/8/134877089/7855157.pdfIn PDF document text
    • http://sodalabs.pro/canon_mp190_ink_amazonxfrzt.pdfIn PDF document text
    • http://bufo.online/accounting_101_philippinesrjjlb.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/iiiigg3/ants_on_a_log.pdfIn PDF document text
    • https://cdn.sqhk.co/kagofiwavum/gglahg6/las_cruces_new_mexico_police_reports.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/gchi0kI/volozezagobadibefu.pdfIn PDF document text
    • http://axecheat8.xyz/que_significa_el_incienso_en_la_biblia_catlicaflnid.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/12974021528.pdfIn PDF document text
    • http://femokotafi.66ghz.com/subaladawasesojo.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/98525463864.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://pedovebewazafuv.epizy.com/fudufe.pdfIn PDF document text
    • http://zatofax.rf.gd/clinical_bacteriology.pdfIn PDF document text
    • http://loxogosune.rf.gd/sogixi.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_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 5052 bytes
SHA-256: 1e58a8f8f878eb4a0a174cbaa6761281bafbc7226e5f7d83fac91f4f9969631e
font_01_sfnt_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 10960 bytes
SHA-256: 7355ca1a0e6d1f918b73b5f1f9c565298a2f67562020eccac29217d09eb93ce2
font_02_sfnt_off00012fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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