Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95d785e1afe70c4…

MALICIOUS

PDF

69.9 KB Created: 2021-01-25 07:19:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cf5799db1d70503b2f2cd181a3593b4e SHA-1: 9b58b36295d4d3a116978290206e57ee11435302 SHA-256: d95d785e1afe70c46ad3af32c1afe98386d3b895203ed4a820e108a5a1f0aeed
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of many links suggests an attempt to redirect users to potentially harmful websites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=iphone4+battery+case PDF link annotation
    • https://dupopawo.weebly.com/uploads/1/3/4/6/134652833/toxobugife.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/danuw.pdfIn PDF document text
    • http://doxisolawasusig.66ghz.com/citect_anywhere_android.pdfIn PDF document text
    • https://lakogobeza.weebly.com/uploads/1/3/4/0/134096968/dbcfab127e0e.pdfIn PDF document text
    • https://vojumemij.weebly.com/uploads/1/3/4/4/134473557/tajolorax.pdfIn PDF document text
    • https://takesefitetipal.weebly.com/uploads/1/3/2/6/132682925/dudogemujonedimiluv.pdfIn PDF document text
    • https://livekurot.weebly.com/uploads/1/3/4/4/134443702/ebb039008.pdfIn PDF document text
    • https://talupujepanuzan.weebly.com/uploads/1/3/4/5/134595677/0565f.pdfIn PDF document text
    • https://xorodipilubila.weebly.com/uploads/1/3/5/3/135311864/mifarinudad-jalozidevo-butoladozirupo.pdfIn PDF document text
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/pikuzis.pdfIn PDF document text
    • https://xurobogi.weebly.com/uploads/1/3/1/1/131163732/lutegifixu.pdfIn PDF document text
    • https://vufavinit.weebly.com/uploads/1/3/4/6/134649981/189cf7.pdfIn PDF document text
    • https://ligexuvuzi.weebly.com/uploads/1/3/0/8/130814340/lexisef.pdfIn PDF document text
    • https://rofujerejikuf.weebly.com/uploads/1/3/5/3/135388349/bezutilaset_nazemufefukakop_gobire_kojivaleju.pdfIn PDF document text
    • https://rugomekedakore.weebly.com/uploads/1/3/5/3/135302214/fikokaxeterowixesu.pdfIn PDF document text
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/rawozuvikom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojosikol.epizy.com/21170360497.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/bhakta_prahlada_dialogues.pdfIn PDF document text
    • http://relaweki.rf.gd/american_truck_simulator_bus_mods.pdfIn PDF document text
    • http://kemubozureta.epizy.com/31427668605.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_off0000d53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53C 5256 bytes
SHA-256: 1569f592dbd2025ac13f97504ff82ad09674c4e548d52138b75fb614e1ff9751
font_01_sfnt_off0000e71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 10500 bytes
SHA-256: 04d3da0f18b90280360c890c17c0c43eb821291c16df1a5ff04e02bc00813d8a

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