Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47c18ff1a55d368…

MALICIOUS

PDF

73.0 KB Created: 2021-03-09 18:13:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6f858d78078c1c0b8ca360db020f1e0f SHA-1: 131e1aeb0cb060d908f9783b6b7e63b2b92f63fa SHA-256: a47c18ff1a55d368809ae445388f64235bd47e7863644232c7a0d593e8b53b04
186 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 0.9997

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
  • 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://resalured.ru/123?utm_term=osrs+birdhouse+run+guide PDF link annotation
    • https://cdn.sqhk.co/tevosenijosu/lziagem/24852800534.pdfIn PDF document text
    • https://cdn.sqhk.co/tigepukeri/Ibif3ih/85249138300.pdfIn PDF document text
    • http://mainsale.pro/32953507100lyjs9.pdfIn PDF document text
    • http://rollernefrit.xyz/suzunukokaresetcy15.pdfIn PDF document text
    • http://richteam.site/linabojcbzz.pdfIn PDF document text
    • https://cdn.sqhk.co/vumatoxikom/hYfTSJQ/king_of_fighter_kung_fu_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rutesawir/fifjbpw/2640524006.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_1fb6e2ffd79c4944a6b2a15d313bb945.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/30393211519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3ce116-8fb0-44cf-894e-0390ba14e2ae/how_to_clean_with_microfiber_mop.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/46033616858.pdfIn PDF document text
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_7b4e3d3fa3a8466b84b5cf4dfe648b2a.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_5176be9bbf1540fa99d2c27303e737a3.pdf?index=trueIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_1c01c5e7040a446d89f1eeeaabac35a2.pdf?index=trueIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_7afa4c4139514b58a1a2ac8e8c4137cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c02373f4-0003-4c3d-beb0-3fd40408c1e2/94550345495.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_off0000e1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B9 5012 bytes
SHA-256: f1a442535f6619aa1c912a7fd8cbbc6600df4f7402d1b9791915a8fd2c4b4b7d
font_01_sfnt_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 10712 bytes
SHA-256: 84498f4280e144fb1c7189504499df28b72fdd8581c19bb2ac212bbf6dfd901d

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