Malicious PDF — malware analysis report

Static analysis result for SHA-256 d529802eaa40e977…

MALICIOUS

PDF

85.1 KB Created: 2021-03-02 22:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4d1ca5d14af6e4c0e7e91f4fd8e3c95f SHA-1: d8296621977453d19d360b74244ecb1623dc90b3 SHA-256: d529802eaa40e9771049b3fa5110c9f354ab21cf5cac6310378510613dd613e0
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and are likely used to distribute malicious content or conduct phishing. The heuristic firings indicate this is a malicious redirector and a link farm, with ClamAV also detecting it as Pdf.Phishing.Trojan. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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.
  • 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/strik?utm_term=express+1+%2528rapid+express%2529+%252F+endicia In PDF document text
    • https://digakope.weebly.com/uploads/1/3/5/9/135974251/a82c36b21cecb3.pdfIn PDF document text
    • http://instapriz.online/41024943211unkce.pdfIn PDF document text
    • http://hugertely.xyz/diary_of_an_oxygen_thief_author_other_booksym69d.pdfIn PDF document text
    • http://counterman.ru/ba_challan_form_punjab_university_2018iqu1i.pdfIn PDF document text
    • http://leomannapov.com/definition_dotted_line_reportingvhfkn.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/4073314.pdfIn PDF document text
    • https://linepofikoleku.weebly.com/uploads/1/3/4/4/134492010/tululilu.pdfIn PDF document text
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/ef8eb819.pdfIn PDF document text
    • http://newberginvestmentproperty.com/adventurers_league_character_sheet_fillableirkg6.pdfIn PDF document text
    • https://rafomuvufeja.weebly.com/uploads/1/3/1/8/131856077/zowomumebozorenaw.pdfIn PDF document text
    • http://thedefenseforge.com/zowijifobuzatuziweyjne2.pdfIn PDF document text
    • http://wisitens.online/vuzevexosimitijexikopixosxs1l.pdfIn PDF document text
    • https://gefizubumob.weebly.com/uploads/1/3/4/4/134473977/cace01bb7bcf4f.pdfIn PDF document text
    • https://murimuwisoruda.weebly.com/uploads/1/3/4/0/134017177/f557090.pdfIn PDF document text
    • https://batuginuvitewaw.weebly.com/uploads/1/3/4/0/134013132/texukegagevedigalola.pdfIn PDF document text
    • http://newyearshop.site/child_care_licensing_orientation_california050px.pdfIn PDF document text
    • https://rixagaxovexi.weebly.com/uploads/1/3/4/0/134000332/dufumudo_zevenari_zobipide.pdfIn PDF document text
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/totujalevejobuv.pdfIn PDF document text
    • https://kodikitowi.weebly.com/uploads/1/3/4/7/134768405/5693137.pdfIn PDF document text
    • http://pl50off.info/3d_touch_android_developeramvj1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7B 5300 bytes
SHA-256: 358a83395a37723096e7a48d73e5cdde2103c809da40d52b6d0b2ea6a52dc6e1
font_01_sfnt_off00011fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB2 11508 bytes
SHA-256: 171b8737d36486290ed63957fb2b929f3be6cc477a0e067b9e550dc5a0ade831