Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f2a781116059fb…

MALICIOUS

PDF

77.0 KB Created: 2021-03-20 03:12:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6e75d6de5bc6c7e4a97a0b71ab975de5 SHA-1: c9f2ee62bd73347f20fc750571b6f774f6b52732 SHA-256: 94f2a781116059fb227d10a235ff86fc1def5cbfe606c32665a4220025d8961a
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to 'Asme valve standards pdf'. The presence of multiple disposable hosting links and a high ML classifier score further support malicious intent. The primary attack pattern involves directing users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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/123?utm_term=asme+valve+standards+pdf In PDF document text
    • https://burodepizojeke.weebly.com/uploads/1/3/2/6/132696233/gilemapagezezimevida.pdfIn PDF document text
    • http://nojuror.22web.org/94386345521.pdfIn PDF document text
    • http://duwelizub.mywebcommunity.org/likazog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_600b08c41ef8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415308/normal_5fc90c87609b8.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/hhvhdjb/weather_radar_orlando.pdfIn PDF document text
    • http://xeropokawat.22web.org/zijajikisodovimademavino.pdfIn PDF document text
    • https://cdn.sqhk.co/xupotuferu/egchg5f/60997858829.pdfIn PDF document text
    • http://tomerezadix.iblogger.org/wodefovuj.pdfIn PDF document text
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/666894.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/TgjRKih/advanced_space_flight_full_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403533/normal_604d1d9840e5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_60302d47f3cfb.pdfIn PDF document text
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/3dadab8b5af2600.pdfIn PDF document text
    • https://digikugububim.weebly.com/uploads/1/3/0/7/130774990/6629372.pdfIn PDF document text
    • https://zezowamizafomex.weebly.com/uploads/1/3/1/3/131381240/cd33576.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tepominofujemo.atwebpages.com/nulunenijimapupu.pdfIn PDF document text
    • http://mugazukadum.onlinewebshop.net/ad_hoc_wireless_networks_textbook.pdfIn PDF document text
    • http://kosuvoz.epizy.com/70658651491.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 5236 bytes
SHA-256: 617ae8631012264be234e90ca5b9c9b1552d8376cce172171f3ae6895ee7a403
font_01_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 10972 bytes
SHA-256: 31382935722d2522de919945f24e120659c1c65c5307d4d54e56b1186ee46362

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