Malicious PDF — malware analysis report

Static analysis result for SHA-256 61eaf9c4f4b7b1b3…

MALICIOUS

PDF

75.4 KB Created: 2021-03-23 19:58:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6908ff9b4872e6fcd50b166299c00c9b SHA-1: 2679bd4ca4e2bbd342bd5ae003b4a6b103b56b9c SHA-256: 61eaf9c4f4b7b1b399f8dd7310716004a5a5abbdc849888d381c7ef4441316b0
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The document body, though heavily obfuscated, contains references to audio equipment and software, which is likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/strik?utm_term=how+to+use+presonus+audiobox+with+garageband PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389794/normal_60338eb6bc4e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405420/normal_5fe1157cabecf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374860/normal_5fe2b53e7df32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_60494771e3c7a.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/vufanajuru.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/pebefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499673/normal_5fe987ef6a54f.pdfIn PDF document text
    • https://moxuludo.weebly.com/uploads/1/3/4/7/134759924/towedugamupuva.pdfIn PDF document text
    • http://disetikala.22web.org/graphic_design_jobs_salary_in_bangladesh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503309/normal_6024f3c81e895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481990/normal_5fe8b9c8876f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419235/normal_5ffce380d30e5.pdfIn PDF document text
    • https://vebogeperudibot.weebly.com/uploads/1/3/1/4/131455328/513875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465010/normal_6046453d191e7.pdfIn PDF document text
    • http://girizug.22web.org/small_cute_babies_images.pdfIn PDF document text
    • https://kidodizaramaba.weebly.com/uploads/1/3/4/0/134096495/zodufoxikijufowojuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bunopudo.rf.gd/33683234743.pdfIn PDF document text
    • http://mijemem.rf.gd/bumumexorax.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/45948045407.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/dumelixizulegesuziw.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/50031734178.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/gaggia_titanium_fill_water_tank_error.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/cardioversion_farmacologica.pdfIn PDF document text
    • http://supijidexigoba.epizy.com/dr._esselstyn_diet_guidelines.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_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 5452 bytes
SHA-256: aa987a40bef63afc5e097ef098679143c9db2739177d6c48ef184d619bfdbe36
font_01_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 10524 bytes
SHA-256: e18819469289d624725dcd252acdde2be667e296828686f7a1583739cee78588