Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab382d7df16ecb1…

MALICIOUS

PDF

81.5 KB Created: 2021-03-01 08:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4a39029f1b8e2f4442aa6b058c4c7f9d SHA-1: 24149ac1521d9133d0c31aaaa103ec59f1bd1be1 SHA-256: 5ab382d7df16ecb1b4d495fe80435bddd17b90ebc3b8870771c640ccf721b5a5
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=gamma+pi+kappa+alpha+psi PDF link annotation
    • http://megalit-korolev.ru/865840705016ewxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484632/normal_5fdd45e8537dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466666/normal_5fecba4065abe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473902/normal_5fe87ae91c8de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496818/normal_60047b5e1797a.pdfIn PDF document text
    • https://kuwumezebuxe.weebly.com/uploads/1/3/4/1/134131528/6b9be188455cfe5.pdfIn PDF document text
    • http://dresdenpharma.ru/55495850564kq11.pdfIn PDF document text
    • http://gepavozo.mygamesonline.org/34949035788.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/the_hunger_games_mockingjay_part_2_official_trailer.pdfIn PDF document text
    • http://didazema.mypressonline.com/xizawevom.pdfIn PDF document text
    • http://aycotoro0.xyz/trivia_crack_questions_sciencev3732.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/numunenoji/all_my_sons_act_1_short_summary.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/english_phonetic_alphabet_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/watipedemoziwumonuxazibo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 5056 bytes
SHA-256: 2662431ebe8f807ac4b1a7be1c9820403e0d4031f4edf050ea4c6dc9b7be6a6e
font_01_sfnt_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 12264 bytes
SHA-256: fcdbcdd537598e86e98566c8a502146900277c3a5b55c251faf6f0fdcc105987
font_02_sfnt_off0001240d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240D 16064 bytes
SHA-256: 49bd45ccc3726cf27e1247f94abf90f7b723d13bb71b293ea1adf6bb4ae2b6d8

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