Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b182cd521076759…

MALICIOUS

PDF

83.3 KB Created: 2021-05-13 14:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e1acae098c5c2806ff0b6f1b8a21a22f SHA-1: b4fca3072fff89cbabe1774141e507f51dce65b1 SHA-256: 4b182cd5210767590f0cc438ec8713691d71ea322e903319040db1414f30343f
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services or domains commonly associated with phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure suggests it's designed to act as a link farm, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=sonoma+county+bus+to+san+francisco+airport PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384318/normal_604670c474421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_60194b3239480.pdfIn PDF document text
    • https://wawokosekipazas.weebly.com/uploads/1/3/1/4/131452886/59246d7.pdfIn PDF document text
    • https://gefobivuvevu.weebly.com/uploads/1/3/1/3/131380717/xarudugunopix_rikosimugilimo_jozene_zobuwibixarobo.pdfIn PDF document text
    • http://rejexinek.22web.org/john_watson_behaviorismo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382429/normal_5fe11008cb557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_605d0d4c313dc.pdfIn PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/bakep.pdfIn PDF document text
    • http://return-0.com/52054802332u6ybu.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/bomanote-rasazixepokozi.pdfIn PDF document text
    • http://goproits.com/silent_knight_5820xl_manual_espaol9dot7.pdfIn PDF document text
    • https://dijavagom.weebly.com/uploads/1/3/5/3/135325372/pivigadupeko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_5f192415e8154691bf566e482c4d5402.pdf?index=trueIn PDF document text
    • http://gilokokivaw.epizy.com/vagafek.pdfIn PDF document text
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_2e0231a9109d4556a02c1b1613c04395.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_83fa02c73c0a4ed49152de01b08b0f94.pdf?index=trueIn PDF document text
    • http://bezepegu.epizy.com/sobexuvelulanulijok.pdfIn PDF document text
    • https://105d84dd-9b22-4355-af37-21382b2db671.filesusr.com/ugd/f4243a_db7fad8da38a42588a890543e305e025.pdf?index=trueIn PDF document text
    • http://kajifota.epizy.com/12263811091.pdfIn PDF document text
    • http://vosakazabed.rf.gd/refim.pdfIn PDF document text
    • http://degununizezubom.rf.gd/how_to_pair_lg_tone_bluetooth_headset_with_iphone.pdfIn PDF document text
    • http://tafobinememen.epizy.com/outside_gate_code_lock.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_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 5472 bytes
SHA-256: 1e4f72c505c0b9e41c086660a6c985dfeb816f410dfe7172bb217ecebb8b25ad
font_01_sfnt_off0001194d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 11132 bytes
SHA-256: 8a6c6306216a3c76ec2c4091eda7ba0b6007b1e37ddd898787f1de2755874b90