Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d44de1bf30cb77d…

MALICIOUS

PDF

76.6 KB Created: 2021-03-07 11:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 998b145db1f53f42167331228623baa8 SHA-1: 18b29ad816e668a9a7fe54aff468b10a57884c5c SHA-256: 3d44de1bf30cb77d215a2fabe6210494b8b1ac32843f2845f1934e1c67bdfe48
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The presence of a question in the document body, combined with the ML classifier and ClamAV detections, strongly indicates a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious intent, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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://jottigo.ru/strik?utm_term=cuantos+cm+hay+en+30+metros PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477913/normal_600b57105ec48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_60273d93d624d.pdfIn PDF document text
    • http://modebedunizux.iblogger.org/energizer_max_9v_datasheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_604325fe386ea.pdfIn PDF document text
    • https://merugerizun.weebly.com/uploads/1/3/4/3/134337850/xamipifesoxigume.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382631/normal_5fcbaaf8cce54.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/VmK5Jjg/11x11_soccer_club_manager_mod_apk_download.pdfIn PDF document text
    • https://letavozogat.weebly.com/uploads/1/3/5/9/135978758/fc37910e1.pdfIn PDF document text
    • https://pikiravu.weebly.com/uploads/1/3/4/3/134347639/477117.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417537/normal_5fe2cfbb481b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458413/normal_5fde069270b1e.pdfIn PDF document text
    • https://sudegefaxir.weebly.com/uploads/1/3/5/3/135323135/1d7cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_60137c9707067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_601b49698cfa8.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/fihgjTp/mastercraft_new_crafting_game_ios.pdfIn PDF document text
    • https://fijuzezakuxulow.weebly.com/uploads/1/3/5/3/135391315/b73ad76edd38e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487432/normal_5fcd563d3f4b7.pdfIn PDF document text
    • http://zulojijimom.iblogger.org/wow_vanilla_enhancement_shaman_leveling_guide.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
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_3b7ce2db19ad4555922e330f749ae9a5.pdf?index=trueIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_9db2b9293af14250843af5873df02d1e.pdf?index=trueIn PDF document text
    • http://xadeboni.epizy.com/woretobibaf.pdfIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_21de053234724a0fa3c6fcb36abc1994.pdf?index=trueIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_0ed5a2b16e254beea92e5f3250a2be41.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_26655d43772049e88feee254d09ea85b.pdf?index=trueIn PDF document text
    • http://gebutetivifupa.epizy.com/18721645011.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_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 5272 bytes
SHA-256: c1049fc1cf953fc42f3e23233d30d7b853c053252fdb925200208f112aa4d240
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 11512 bytes
SHA-256: 65cd0d94506fed4b8bf8aa27e78c4818bfb3e06040cc013ecac4bb4868143af3
font_02_sfnt_off0001151f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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