Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef6adee03d14812…

MALICIOUS

PDF

90.6 KB Created: 2021-03-23 21:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4edd93bb5d484666c8216f8eba41d3ee SHA-1: 80b2b5b91e589de22c4046ae9dcaab29ac57f6df SHA-256: 5ef6adee03d14812bd20f3ec8c13932c58d12bd10e27c058a1d938800d9f501b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic firings point towards the document being used to redirect users to potentially harmful content.

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://xezojetit.ru/award?keyword=aspen+hysys+manual+pdf PDF link annotation
    • https://lelunoforonu.weebly.com/uploads/1/3/1/6/131606056/3071169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419849/normal_603d09550368b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470533/normal_5fcd162635917.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489846/normal_5fe2acfdcb2e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375522/normal_604a02b0d9114.pdfIn PDF document text
    • https://wosowabo.weebly.com/uploads/1/3/4/3/134340570/3462740.pdfIn PDF document text
    • https://nadaroxiwe.weebly.com/uploads/1/3/4/6/134688146/8983509.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/6132097.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/78835757018.pdfIn PDF document text
    • https://mezulawa.weebly.com/uploads/1/3/4/5/134597648/e3f4a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470967/normal_5fef38e80b7dc.pdfIn PDF document text
    • https://gumikixinugud.weebly.com/uploads/1/3/4/8/134864359/fidup.pdfIn PDF document text
    • https://xidelora.weebly.com/uploads/1/3/5/2/135296398/bubuleduna-fewome-ponupugilafumow.pdfIn PDF document text
    • https://sorasewemo.weebly.com/uploads/1/3/4/3/134358680/fovegawoseloroveson.pdfIn PDF document text
    • https://zekorawuj.weebly.com/uploads/1/3/4/8/134862422/6122937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456132/normal_602b224d1a0de.pdfIn PDF document text
    • https://timelasabo.weebly.com/uploads/1/3/4/3/134345700/40c8d3b82acc2.pdfIn PDF document text
    • https://jafuxanabowam.weebly.com/uploads/1/3/5/3/135383447/malafonawimonu-kibegofes-taxasuredo-mekidagexalax.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/behringer_q802usb_noise.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501385/normal_5fe24b60c3a40.pdfIn PDF document text
    • https://lavivatum.weebly.com/uploads/1/3/1/4/131437335/9600495.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/xaxolaboxeto.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_off0001262b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262B 5276 bytes
SHA-256: 33be4a3ce7568be590c03cee3423f024f22fdcb4b56ebdeb07e7b21a39a4e132
font_01_sfnt_off00013804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13804 10852 bytes
SHA-256: d342eb3ac4b011d0f30ad9fdbadaeb69abfc8d9bc8cd49e09723642244cf0557