Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2a84cb932bb949…

MALICIOUS

PDF

80.2 KB Created: 2021-04-11 05:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 41dffb6d854b76ff6d47d368d43ae01c SHA-1: c9361857f74369213c2b59d74a69edc16fe1d057 SHA-256: 0b2a84cb932bb949ea4b3dd581d604916d3c18af1aac804e5839ffd0aafb0e5b
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 domains or redirectors, indicating a link farm designed to lead users to malicious sites. The presence of a link to a known malicious redirector and the ML classifier's high confidence score further support this assessment. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive redirection, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=why+is+my+heating+blanket+blinking In PDF document text
    • http://marinarus.space/rivorubebizxufjf.pdfIn PDF document text
    • https://lolutisoxat.weebly.com/uploads/1/3/4/3/134315909/8226277.pdfIn PDF document text
    • http://werenntaq.online/faxozudupozepefabud54re1.pdfIn PDF document text
    • https://zunudomulu.weebly.com/uploads/1/3/4/6/134604261/nulevodokisupom-tuziwaxojupet-jejesijedo.pdfIn PDF document text
    • https://wajotirege.weebly.com/uploads/1/3/5/3/135306859/jixavulejinaburo.pdfIn PDF document text
    • http://merovew.xyz/29635284574gujmt.pdfIn PDF document text
    • https://fotobuwab.weebly.com/uploads/1/3/4/3/134368258/zerulazasirex_tijax_xaxuzudizomikim_wijuregoxikud.pdfIn PDF document text
    • http://nextauto02.ru/pejezixotejunob74fbx.pdfIn PDF document text
    • http://fruit-ital.space/its_kind_of_a_funny_story_netflix_castwprm6.pdfIn PDF document text
    • https://visegonikagade.weebly.com/uploads/1/3/4/6/134626066/fewulamexirerid.pdfIn PDF document text
    • http://gulibej.22web.org/casio_fx-_95es_plus_manual.pdfIn PDF document text
    • https://zunitilamurako.weebly.com/uploads/1/3/4/5/134529552/ecd6112.pdfIn PDF document text
    • http://reduslimer.website/455654118716hbru.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/8919253.pdfIn PDF document text
    • http://sexesex.site/why_does_my_dog_put_toys_in_my_face820qu.pdfIn PDF document text
    • http://mujumuvibofa.iblogger.org/95811140285.pdfIn PDF document text
    • https://nuvuxupu.weebly.com/uploads/1/3/4/5/134507381/1830850.pdfIn PDF document text
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/d3f62.pdfIn PDF document text
    • https://xofivexaroza.weebly.com/uploads/1/3/4/3/134321457/tutavatojeta_losufofoba_pezumimamakiba.pdfIn PDF document text
    • http://heliusdesign.ru/98791992677qv7la.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sizatopus.rf.gd/nezavanusebiwumefofokir.pdfIn PDF document text
    • http://bimumebuzof.epizy.com/smokey_mountain_smoker_assembly.pdfIn PDF document text
    • http://tativukowodugox.epizy.com/zufegademiga.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_off0000fa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 5320 bytes
SHA-256: 951f4d8f6ab7e5ea369531fa8cc575122dfaef8316a7129b9d1e84d1d6ffd38c
font_01_sfnt_off00010c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C57 11420 bytes
SHA-256: 2d5ed4eeea646a34a7c09a338bdeeb1ccd11098efcb1005faae1989da745ea45