Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a291dfac6e9084…

MALICIOUS

PDF

74.0 KB Created: 2021-03-20 08:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b1433280dc552e8696d3c8d87879b2a7 SHA-1: 19b772ed70198e71b90a752ab037cedf00c64aab SHA-256: a8a291dfac6e90845ff0730358a63a859e7b9477ef5ebe3de50eb25265050f70
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://xezojetit.ru/123?utm_term=amelia+bedelia+full+book+pdf PDF link annotation
    • http://pamesiso.22web.org/40442558283.pdfIn PDF document text
    • http://logvoz.ru/xowarubofeguges8x2.pdfIn PDF document text
    • http://setovewurepenu.22web.org/rokuw.pdfIn PDF document text
    • http://fruitnaturs.space/4321600948192943.pdfIn PDF document text
    • http://zathkatow.xyz/19001154380ltz2a.pdfIn PDF document text
    • http://simultaneously.space/wusivirukugupinodogufe4m1qn.pdfIn PDF document text
    • http://cleaner360.shop/how_to_take_permit_test_online_massachusetts0qvag.pdfIn PDF document text
    • http://vittorguxx.site/functional_requirements_specification_formatuw5ts.pdfIn PDF document text
    • http://vovevowumusiki.iblogger.org/mercedes_france_certificat_de_conformit.pdfIn PDF document text
    • http://winoraama.space/75420485931wxhkz.pdfIn PDF document text
    • http://devlp.design/79157759273eo4c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvibopa.epizy.com/japanese_grammar_book_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1938269-312e-4dc1-8418-4c1b03f1d72a/61641291793.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/limevodefiwum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9122042-1566-49a3-b915-9b82a1ea4fb0/88837731980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49dfc1f6-09c2-4d6b-bc6e-792be56d2d89/89098575181.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/47101202924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad1615e-a3c8-40b4-ad38-6bb9c0bb9f95/pawagifolalasijefasazazep.pdfIn PDF document text
    • http://patubakofizoz.epizy.com/zovowuwuxonagejore.pdfIn PDF document text
    • http://guvugapezo.rf.gd/kovabokomivaruwamubasugu.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_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 5108 bytes
SHA-256: 19f8153c381abddb9e9087294ffd9ef46e67866d45162b934258dc3e8f59d3d4
font_01_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 10972 bytes
SHA-256: 88b6d625a7ff4ca5202852310b79fd8a75522390c6ba1fc257724623730297f7

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