Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbda085acf76250…

MALICIOUS

PDF

72.1 KB Created: 2021-06-11 16:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 22f8ef4430ee93d891c15e062324f021 SHA-1: 6611a5913ba9b5493c1e3d0ad434ce1a50627ccd SHA-256: 7cbda085acf7625018dda0a48f9a5cfa87bb1cf3e804389d2bc80145d1dff1b6
194 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 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 7

  • 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.
  • 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://laborke.ru/pbw?utm_term=5th+standard+social+science+book+kerala PDF link annotation
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/1401776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421042/normal_6027e48bdc326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446773/normal_5fc679f4951e5.pdfIn PDF document text
    • https://zegadakupoxak.weebly.com/uploads/1/3/4/7/134749069/34369b9e1.pdfIn PDF document text
    • https://wasaxedunup.weebly.com/uploads/1/3/1/4/131453111/wakot-nolatevovububil-minavideb-rapit.pdfIn PDF document text
    • https://bulobazopikiju.weebly.com/uploads/1/3/0/7/130776241/nuzane.pdfIn PDF document text
    • https://memefuzagimo.weebly.com/uploads/1/3/4/6/134612336/f920ed8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428083/normal_5fd9a713c1daf.pdfIn PDF document text
    • https://bogidiwimo.weebly.com/uploads/1/3/4/7/134717669/tabakef-popebinof-domexaji-lorutowefugi.pdfIn PDF document text
    • https://taxubixud.weebly.com/uploads/1/3/4/7/134760406/1785789.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4489601/normal_60b0144e80136.pdfIn PDF document text
    • https://nowebapimigofok.weebly.com/uploads/1/3/4/3/134338607/bugagonoxug_balekopupaluf_diminizedadezis.pdfIn PDF document text
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/1033583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474736/normal_6003b84e1376f.pdfIn PDF document text
    • https://zedalikekotax.weebly.com/uploads/1/3/1/1/131163955/b2b38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490256/normal_60bb7b4923084.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xujaripusa.pbworks.com/w/file/fetch/145065225/40417283373.pdfIn PDF document text
    • http://pijipusap.pbworks.com/f/wire_rope_capacity_chart.pdfIn PDF document text
    • http://najajadux.pbworks.com/f/hacked_cooking_fever_apk.pdfIn PDF document text
    • http://jasiduvegulu.pbworks.com/w/file/fetch/144567807/birthday_compatibility_book.pdfIn PDF document text
    • http://liguduper.pbworks.com/f/best_numbers_to_prank_call_australia.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_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 5260 bytes
SHA-256: 790148105541d78f73119702899ef9fc4dc1790b3b3c74d314e49666cec1e9a1
font_01_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 10600 bytes
SHA-256: 1d1f8da4614a720f6aa127559efa0014d5125969a7d10e2f8955c3e3778d4671