Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef491efcf11e72c…

MALICIOUS

PDF

87.1 KB Created: 2021-04-03 21:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0684635d71347d1caf665c8063431b9a SHA-1: b33a87f42db1e0fe5fe08cb30d446ea0a0b6dd29 SHA-256: 3ef491efcf11e72cda0167f3bf5d9a91ac712b9cfd8f9e4bd64220e5af82b517
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/wix?keyword=robot+wants+fishy+max+games PDF link annotation
    • https://cdn.sqhk.co/futevanu/ijWjjh4/rock_climbing_walls_near_me.pdfIn PDF document text
    • http://bossyonlinex.com/what_the_quran_says_about_other_religions59jnd.pdfIn PDF document text
    • http://prequester.online/849596018m0plv.pdfIn PDF document text
    • http://mscredit.info/julewuvagevasozajodui3d7t.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/lukozewidezuw.pdfIn PDF document text
    • http://bilet-pdd.site/70949674622hy3x0.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/g43ZDfV/100_fun_activities_games_to_play_online.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/dQhaVha/teniku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483587/normal_6041848e85581.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/jitfgiu/bulleit_bourbon_whiskey_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445118/normal_5fe33dc1e86e7.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/alihwhj/marixikovuvirotase.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/bokojefezoboza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/03f03cbf-92f2-4b26-856e-703137cab1a4/18812680737.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_0aae74d5e3ae43bfb180f2a22f63e60a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e737552-aeb9-4733-83f8-61b48616c59b/honda_generator_customer_care_toll_free_no.pdfIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_07a386658229472e964144fba1ae3655.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b1d3f5d-c78d-436c-96dc-1067587c1f6b/ipad_mini_2nd_generation_screen_size.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 5252 bytes
SHA-256: 315f6c45485d46899d3e39863fe6043550652ba5dac8e4e8b13253405d689b9c
font_01_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 10900 bytes
SHA-256: 2423b4fc5dcbec3dae4ae2fcdeda4adfe1acbf212546ce7014a70e710a358c31
font_02_sfnt_off00014141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14141 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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