Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b13daf7b1912eda…

MALICIOUS

PDF

75.3 KB Created: 2021-02-13 05:33:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fd297a86d4ff59128b0d68848f6b8d62 SHA-1: b2e879194e31b85a37723ed5a6a2b04df5b5a7c6 SHA-256: 7b13daf7b1912eda0aec11c91d478dacb858282606be41b0bc0a7ff402918327
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 0.9998

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://leonvi.ru/123?utm_term=forever+21+promo+may+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476420/normal_5ffac29744c23.pdfIn PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/8521655.pdfIn PDF document text
    • https://wakebanimoxebej.weebly.com/uploads/1/3/1/3/131383753/416896.pdfIn PDF document text
    • https://cdn.sqhk.co/jetobatu/ZjeijEX/97463039375.pdfIn PDF document text
    • https://cdn.sqhk.co/diwomijo/sHhdrhe/batesilenetasubened.pdfIn PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/ritufu.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/Bphfjjq/degowifiradiru.pdfIn PDF document text
    • http://pefipegukanijel.22web.org/arteriografa_cerebral.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420743/normal_5fdd65cc10c91.pdfIn PDF document text
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/tekopuleniso-zalonisifowaja.pdfIn PDF document text
    • https://rafopovuweke.weebly.com/uploads/1/3/2/7/132740485/7489409.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/fMjUYdf/49503431455.pdfIn PDF document text
    • https://cdn.sqhk.co/pofadugilip/hhifib8/colossal_cave_adventure_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vopepogam.rf.gd/70889614640.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/rikixanovepijojimib.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/windows_10_home_student.pdfIn PDF document text
    • http://perurafofasiw.epizy.com/vezeloliletelafirafut.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_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 5196 bytes
SHA-256: 23a5e21762eec18541a0d662f88df853ac662a2ef534963b690355c3dc8456f2
font_01_sfnt_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 10804 bytes
SHA-256: 5629386d640de4b50a01d9c4aade9df221b36b3d9dd5637c0a0ca9e6acf281f3

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