Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4118f8663bbccd…

MALICIOUS

PDF

71.7 KB Created: 2021-04-03 04:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 632be5a2bf781c43bd8b1c6df45d3f1b SHA-1: 8299a6caf21a8eb3179717bf2afc12eddebb96e4 SHA-256: dd4118f8663bbccd8c9b3a7f7dc6a9f80150ff862b6bdd4ccc0b2196d4048d47
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/wix?keyword=ecolab+apex+manual+detergent PDF link annotation
    • https://cdn.sqhk.co/wodigajamu/GhaZjga/7550263452.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/BgfBgji/jidetur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_6031741e2fd0a.pdfIn PDF document text
    • https://gelasinez.weebly.com/uploads/1/3/4/7/134763890/d3a2145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471464/normal_602a41529a850.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/Hicjaie/mlb_schedule_playoffs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_602e00cac4c89.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/ifxPhb4/indonesia_business_news_today.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/9460741.pdfIn PDF document text
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/jitumesizozoxefiz.pdfIn PDF document text
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/wadub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527108/normal_5ffb995681f53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_6039256dc7238.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_25a239aedc9944098e565564e3d9bdb7.pdf?index=trueIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_581bcc9e61254669bdf961c5c03ff458.pdf?index=trueIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_940a334500b34d2c973774f0dfe34a92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98c8bbdb-f65b-4d51-b198-c3d3cb1fc668/husqvarna_435_carburetor_adjustment_tool.pdfIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_bd202149dd9f4761b27494371cd36424.pdf?index=trueIn PDF document text
    • https://0f939073-77d1-4307-aaa8-42539c8515e3.filesusr.com/ugd/85c9df_1f28b3f563d841c7b1b86ed5ff8a68a4.pdf?index=trueIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_05600825c67843bdbaeac5babefdd9b2.pdf?index=trueIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_85106d2d0feb4f44bc338c77aef25883.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d564e493-64ea-4c3a-8d20-baa5115de53f/why_is_my_iphone_not_connecting_to_syncing_with_outlook_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc86c9a-63e1-464e-bc1e-da111b6e10b8/wamovagujewopufas.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_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 5380 bytes
SHA-256: 23d29025b6467f86551e9329358fa4514a90a93b422bda704094837954802c32
font_01_sfnt_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 10580 bytes
SHA-256: f48e9775526bb238293f727fcf4dee574e96789e68f493fffd2f6b9c31c90917