Malicious PDF — malware analysis report

Static analysis result for SHA-256 1024210bd66abb99…

MALICIOUS

PDF

81.7 KB Created: 2021-03-25 05:27:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 45d87441963ef0aa401e1e77dbd16391 SHA-1: 13919ee4497e6276ba135f777d6516561d92d71c SHA-256: 1024210bd66abb993aaea9e517d596acea0ab684e33d60f881ed363e40d7564a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting it functions as a link farm. The document body, though heavily obfuscated, appears to be a lure related to educational materials. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=multiply+mixed+numbers+practice+and+homework+lesson+7.9+answer+key PDF link annotation
    • https://teseresoj.weebly.com/uploads/1/3/4/6/134644138/6123633.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/biigigd/boxazum.pdfIn PDF document text
    • https://cdn.sqhk.co/dusivubeleza/gjig4ii/lifatixiduxejezeroso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490725/normal_5fc5ad8fc73bf.pdfIn PDF document text
    • https://retariluwefise.weebly.com/uploads/1/3/4/8/134858211/8973456.pdfIn PDF document text
    • https://pivamuwonojazop.weebly.com/uploads/1/3/0/9/130969183/galosowarotubepoviwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478664/normal_60142dece2b56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485156/normal_5fca400fb5d85.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/djeKhbu/87351559584.pdfIn PDF document text
    • https://lalevajapogos.weebly.com/uploads/1/3/0/8/130874146/1748589.pdfIn PDF document text
    • https://cdn.sqhk.co/gotofebelu/Z78AztI/nugirimibugoligowes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418570/normal_6041ae676f2b7.pdfIn PDF document text
    • https://vajojesorenum.weebly.com/uploads/1/3/0/9/130969616/fidamuxud.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/ib8lggJ/72297538073.pdfIn PDF document text
    • https://romidanunopupef.weebly.com/uploads/1/3/1/1/131163616/9ef8fa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408711/normal_603e4908af105.pdfIn PDF document text
    • https://cdn.sqhk.co/zexatexa/TxgjakZ/46658453448.pdfIn PDF document text
    • https://sorawujij.weebly.com/uploads/1/3/4/6/134671526/nodexupikav_tonabow.pdfIn PDF document text
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/4098924.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://solobasoridevel.epizy.com/10096719543.pdfIn PDF document text
    • http://xuxejoser.rf.gd/video_editing_free_app.pdfIn PDF document text
    • http://dipomik.epizy.com/18733516307.pdfIn PDF document text
    • http://kabemetuva.rf.gd/shakira_loca_loca_english_song.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_off0000fff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 6052 bytes
SHA-256: ca1698ffe8ee51fc0c9fbedae5b056c908bbeba220a5d62bfcab8e465719abbe
font_01_sfnt_off00011484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11484 10724 bytes
SHA-256: 6cdeb95c854f6e73d50f3041e44b5dcdd682e167aef770663f61d85a46473b10

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