Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a8b7bd25a58fd1…

MALICIOUS

PDF

70.6 KB Created: 2021-02-21 16:20:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9c540afdafbcb8621d3cae4fcc505ba6 SHA-1: 85d07da7d04afc9a436a006ca927377a882add6b SHA-256: 16a8b7bd25a58fd116730f4ba7d7918dd8da6547a0563e9c2bd8c48980be227c
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 0.9998

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 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://leonvi.ru/wix?keyword=fisher+investments+guide+pdf PDF link annotation
    • http://igcopyrightclient.com/426576305888dues.pdfIn PDF document text
    • https://moforikegumiret.weebly.com/uploads/1/3/2/6/132680993/9653287.pdfIn PDF document text
    • http://fartook.online/rolegapemibim9t0no.pdfIn PDF document text
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/gajesapuseso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_600b27547bb30.pdfIn PDF document text
    • http://studytogether.fun/napusigosujavokqew0.pdfIn PDF document text
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/jarorig-todijodex.pdfIn PDF document text
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/vevofufutopesawoxep.pdfIn PDF document text
    • http://theandyhong.com/fonaxolagogesiworiximowi91fdz.pdfIn PDF document text
    • https://figowemepiwe.weebly.com/uploads/1/3/1/3/131398533/vomalobixiw-mopolomevipu.pdfIn PDF document text
    • https://gipulafu.weebly.com/uploads/1/3/4/4/134442702/mutov-fefet-kabipiwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388416/normal_60054d1b1c6f6.pdfIn PDF document text
    • http://lastmarkt.ru/dynamic_business_law_4th_edition_nan57z09.pdfIn PDF document text
    • https://kexibisurek.weebly.com/uploads/1/3/4/3/134334279/1435877.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/wifukedot/logo_quiz_answers_level_23_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/hippopotamus_as_animal_spirit_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/2008_mercedes_c300_sport_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/autoexec._nt_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/wenatezajazuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/69488371694.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_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 5228 bytes
SHA-256: def22159dd85faf30193cd8f4659afe9489a0032126284c2dca3295437f69546
font_01_sfnt_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 10108 bytes
SHA-256: 9ffd1e973d454cee4531cd84bf8f7530fd089c008cf2fe8c7ce677392d799506

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