Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c4dd7588ace2ce…

MALICIOUS

PDF

92.9 KB Created: 2021-01-25 22:22:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3edf999e09559888a46263fed0b9b763 SHA-1: a3c6cd2cde93adbdc273ff8b33267f4b22a8b905 SHA-256: d0c4dd7588ace2ce174ee19e9ced5e12914de0a824fdf3b8a576d970b69c225b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/aws?utm_term=angular+2+reset+form+control PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476765/normal_60023ae7e0f2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5fdc36764ab28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370288/normal_5fee84786f01d.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/jfihpfH/classroom_timer_20_minutes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409621/normal_60053bb1cd5af.pdfIn PDF document text
    • https://xinomufe.weebly.com/uploads/1/3/4/7/134706409/6670735.pdfIn PDF document text
    • https://lefojokux.weebly.com/uploads/1/3/5/3/135399193/b7cc9.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/b27fc7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490251/normal_5fdc29c1286a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fe5525287a5b.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/AqPid9N/56938308316.pdfIn PDF document text
    • https://potepivogatofef.weebly.com/uploads/1/3/2/7/132740463/xefov_ladepifosulug_murowuzimonubas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406223/normal_6004dab87ac10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484380/normal_5fe4e67f2a87e.pdfIn PDF document text
    • https://nupetumagapet.weebly.com/uploads/1/3/1/8/131859993/wozur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479923/normal_5fcd726fb7fd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368237/normal_5fe57d9e5f789.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387567/normal_600918d549034.pdfIn PDF document text
    • https://wobelafesuta.weebly.com/uploads/1/3/4/7/134767333/fa3a66a9bcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492529/normal_6000fe04d0fa0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408881/normal_5ff16e8ed0365.pdfIn PDF document text
    • https://cdn.sqhk.co/subogutaze/fjcYWNQ/rayforce_arcade_rom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00012c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C86 5320 bytes
SHA-256: fd380c197c7d844c5e020c48f3287768a8c8529a6240f7002b81c1b639e00a9b
font_01_sfnt_off00013e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E91 11524 bytes
SHA-256: 1814b1a575599c52b4bed0b25025b40cba533d02cfe9ca5e7e714b20dcc7ebae

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