Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd85011892288cb…

MALICIOUS

PDF

89.6 KB Created: 2021-03-04 20:50:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 82101071fffb8d9a34642c077b05a0a4 SHA-1: 97bdd3152f6f76c572978ea2dc5dd4c057dafeb9 SHA-256: 8cd85011892288cb5d58a3003ef0f295e9baccb8a6b95c88047aa2e8a091473f
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded links, many pointing to disposable hosting, suggesting a link farm for SEO manipulation or phishing. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://yafferge.ru/wix?keyword=aspen+heights+statesboro+tv+guide'. The document body, though heavily corrupted, appears to reference 'Aspen heights statesboro tv guide', reinforcing the lure. No scripts were extracted from this sample.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=aspen+heights+statesboro+tv+guide In PDF document text
    • https://mizojomi.weebly.com/uploads/1/3/0/9/130969452/7484583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_5fee43320279f.pdfIn PDF document text
    • https://kafunonedejo.weebly.com/uploads/1/3/4/6/134662894/tabur_xolugizexufa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476780/normal_60036d767458a.pdfIn PDF document text
    • https://dutofubexel.weebly.com/uploads/1/3/4/6/134631161/folegadelib.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/2Fhhljj/mcdonald_s_nyc_promotions.pdfIn PDF document text
    • https://rivepolimuf.weebly.com/uploads/1/3/0/8/130813401/319177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_603837b00824c.pdfIn PDF document text
    • https://kigilejujagenit.weebly.com/uploads/1/3/1/4/131438309/9496013.pdfIn PDF document text
    • https://nogusuxewi.weebly.com/uploads/1/3/1/4/131438155/sitekowujubalitibov.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/jbxwK66/repulizafabuto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412996/normal_5ffffe944daa2.pdfIn PDF document text
    • https://duvutonog.weebly.com/uploads/1/3/6/0/136020002/eea0496b0.pdfIn PDF document text
    • https://tabivivefevevu.weebly.com/uploads/1/3/4/8/134889686/mikodireduwolor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384299/normal_5fceaf86e3fb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_600a661b17100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/40637992314.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/wakovuduzaguwon.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/a_mouse_tailed_bat_facts.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/51780303877.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_off00012324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 5376 bytes
SHA-256: 4d991437fb645d19ac27e6a512a0f6679f9d4d95f5485bb91fb9526a92e801cc
font_01_sfnt_off0001356b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 10416 bytes
SHA-256: 26e491345fdaaa8bc2206fbbc1db60e19dc74a5708ce9e7a31b0cda66e599250