Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8ebd6e665872b5…

MALICIOUS

PDF

72.9 KB Created: 2021-03-18 14:13:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24555518d7fe1e5525e065b5cf0a0a09 SHA-1: 2591872d49d25ab1596036679a6b41917cc00e48 SHA-256: bd8ebd6e665872b5ec89babc84c215fe06dbfd334cdf6090aadfeb0b2e6af123
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on link farm domains, suggesting a phishing or SEO poisoning campaign. The primary URL, https://ponafet.ru/wix?keyword=yuntab+q88h+tablet+manual, is likely a lure to direct users to malicious content. While no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of malicious intent, likely to drive traffic to phishing sites or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/wix?keyword=yuntab+q88h+tablet+manual
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/figegujidov-semulevulo-fajesase.pdf
    • https://cdn-cms.f-static.net/uploads/4471464/normal_604a736455ef5.pdf
    • https://cdn.sqhk.co/jisaside/jbKhcha/14334658907.pdf
    • https://cdn.sqhk.co/lituxopevuk/nTiehjq/68504433025.pdf
    • https://rezusoroporinon.weebly.com/uploads/1/3/2/6/132695427/xewolazajumomo.pdf
    • https://rumikupim.weebly.com/uploads/1/3/5/3/135310872/41634.pdf
    • https://cdn.sqhk.co/wuvukidovime/ielgdhd/25855233745.pdf
    • https://wedemewimobuxet.weebly.com/uploads/1/3/4/3/134309086/3404923.pdf
    • https://cdn.sqhk.co/ruzaxube/giibSgd/88978311810.pdf
    • https://sijokazodile.weebly.com/uploads/1/3/1/4/131454207/8010654.pdf
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/buruz_jopakewo_ludosezugix.pdf
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/53082.pdf
    • https://wezusuruga.weebly.com/uploads/1/3/4/0/134096163/mumikizut-mugedamigudefis-nanakoxe-lokedokugumo.pdf
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5ffa60992e898.pdf
    • https://xutebaso.weebly.com/uploads/1/3/4/6/134631295/rizowodidonis-satotosubapi.pdf
    • https://cdn.sqhk.co/fetedudi/m2eF48r/degogedakerezis.pdf
    • https://gesojotumone.weebly.com/uploads/1/3/4/6/134614539/7241805.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d2263947-b98b-4c6f-a77b-b3b6237eff5e/biwivavorogasudamijak.pdf
    • https://uploads.strikinglycdn.com/files/506d6a2e-f693-4ca6-94f7-45939356a029/59830801805.pdf
    • https://uploads.strikinglycdn.com/files/da8108e5-8e34-47a7-b254-3cab62baf67e/thermador_range_parts_near_me.pdf
    • https://uploads.strikinglycdn.com/files/8c7b7162-e47c-44d0-a1bc-1de1dbf121c6/wolemukuvumizip.pdf
    • https://uploads.strikinglycdn.com/files/8b31ec27-ebf7-42fa-a980-131e26cebaab/zigeviwapufejekemeduko.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbff.bin
ca89b9425476caedde9a230e0878aaa730b4ab392e4e8d904dd93a9bcceddc3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 5072 bytes
font_01_sfnt_off0000ed21.bin
b75395fbad7476c379d10b6e14e0390504d8faf4f78cc153cd3a1a0f870df863
pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 12208 bytes