Malicious PDF — malware analysis report

Static analysis result for SHA-256 e363ff5dbec1ff06…

MALICIOUS

PDF

78.0 KB Created: 2021-04-19 19:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b8444dcdef6cf714ed42d12256f14224 SHA-1: 7cd9179bd8ef29ff19b5a37be610a06876a2dfba SHA-256: e363ff5dbec1ff06ef30c745496bac6e0034abc448f1aa9e1412f69c4335c42d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and numerous external URIs point towards a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=what+are+the+different+types+of+database+models PDF link annotation
    • https://webesetumisurut.weebly.com/uploads/1/3/4/3/134318687/gapawokevajerud.pdfIn PDF document text
    • http://limaxinsto.xyz/690835542763sr64.pdfIn PDF document text
    • https://jerijumewatopod.weebly.com/uploads/1/3/5/3/135330781/tisuwepokugise-turemepetuj-kezefojagipemib-buminomanibozer.pdfIn PDF document text
    • http://xxlmature.site/cyber_hunter_wallhack_pcqtjpy.pdfIn PDF document text
    • https://detimuveruriwus.weebly.com/uploads/1/3/1/8/131872178/e65bf.pdfIn PDF document text
    • http://wotevolodux.iblogger.org/line_6_helix_or_helix_lt.pdfIn PDF document text
    • https://woxamaxepid.weebly.com/uploads/1/3/0/7/130776503/kixilefexe.pdfIn PDF document text
    • https://wajirabipuxu.weebly.com/uploads/1/3/0/8/130874591/5735044.pdfIn PDF document text
    • http://mejumeroxara.mywebcommunity.org/91705870258.pdfIn PDF document text
    • http://ramajur.22web.org/53210024164.pdfIn PDF document text
    • http://motorutovibipe.sportsontheweb.net/complete_core_java_tutorial.pdfIn PDF document text
    • http://lemiritafuwab.22web.org/icivics_worksheet_p._1.pdfIn PDF document text
    • http://strongcreditscore.info/rusipidejujwrn8y.pdfIn PDF document text
    • https://jividakole.weebly.com/uploads/1/3/6/0/136090299/kosizurugupe.pdfIn PDF document text
    • http://fajikiviwakux.22web.org/abroad_packing_list.pdfIn PDF document text
    • https://nakabupibuf.weebly.com/uploads/1/3/4/6/134608610/181891.pdfIn PDF document text
    • http://souve.me/memotinopejx8w1.pdfIn PDF document text
    • http://opensol.xyz/how_to_reset_a_sunbeam_heating_pad04zj5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kofaxafogi.myartsonline.com/changes_in_cfa_level_1_curriculum_from_2017_to_2020.pdfIn PDF document text
    • http://wifikip.rf.gd/39087273710.pdfIn PDF document text
    • http://mujebik.atwebpages.com/53364290559.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_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 5536 bytes
SHA-256: 676520004eb0b83143af71d89e194d97aef9f2de005df691a55c7b8bf4e82a2a
font_01_sfnt_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 10564 bytes
SHA-256: eef24243b65f559671bdeacb594e076c45a4849593c5cd6e94f314ef719ffdf9

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