Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c5e125913abbd5…

MALICIOUS

PDF

73.2 KB Created: 2021-02-21 01:35:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: acc2e5a20e177695ceb8c0f0efa8b73f SHA-1: d0b4ade5e7a5de89bb7050c59826e87bffb1fd91 SHA-256: 42c5e125913abbd5317a23565b3c491c933817146ddb59c4ef565b129621be28
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-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://jacksth.ru/123?utm_term=bible+reading+plan+for+beginners+pdf+2019 PDF link annotation
    • https://cdn.sqhk.co/daxegajok/ggdlYw0/pixel_car_racer_hack_ios_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/xhbbgjO/radiant_heat_flooring.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_5fd37c45d3408.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505159/normal_5fc73197d9222.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/miheZgg/83339786002.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379723/normal_5ff84d3fb3556.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/ggigOij/24026493040.pdfIn PDF document text
    • https://memelixuluxowi.weebly.com/uploads/1/3/5/9/135958522/c468273.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/4jhhgcJ/murderer_online_mod_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496816/normal_60248c68c7185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_601e675da8a9d.pdfIn PDF document text
    • https://kowexemi.weebly.com/uploads/1/3/1/8/131872048/9414150.pdfIn PDF document text
    • http://remeik.ru/95900073881nxnuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_5fda5dd58f27e.pdfIn PDF document text
    • https://zebilukirun.weebly.com/uploads/1/3/5/3/135306511/7589845.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/zumagite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450428/normal_6001d71ee7d93.pdfIn PDF document text
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/mupego.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/tamil_movies_hd_new.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/15760022392.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_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 5880 bytes
SHA-256: cd01a740f990c37f2de0388c7f7d7b987def5d34e4c21d87b0382b9e95df5fa7
font_01_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 10240 bytes
SHA-256: ab552ecf90306d0d83a99a51c7043546718f954a4f619ab9b84ef0efb0e33077

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