Malicious PDF — malware analysis report

Static analysis result for SHA-256 df787bc8d5aaaacf…

MALICIOUS

PDF

78.4 KB Created: 2021-03-31 02:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7ec29d1e2f5bc301be070e74cb742455 SHA-1: 58b660d9ed38ab6c537ecf83df66455342f43a46 SHA-256: df787bc8d5aaaacf91bfcd7126432b5e1b80f25a9d237687d35da1e200ea800d
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://leonvi.ru/strik?utm_term=hacking+exposed+9 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456166/normal_6007374f3fdf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495973/normal_6014bd68918e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456687/normal_600f4cb71ea25.pdfIn PDF document text
    • http://profoto22.ru/the_birds_band_list_of_songsvj1du.pdfIn PDF document text
    • http://gogotmif.space/bupuniralujefofesobofoxira23es.pdfIn PDF document text
    • http://tradebot.space/16069906553x1gxe.pdfIn PDF document text
    • http://fullstacket.online/derawu2ua52.pdfIn PDF document text
    • http://ctyr.ru/bavoluxonuwuzikxzdy.pdfIn PDF document text
    • http://techanomic.com/15623833322bm6kj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365628/normal_6005241ada841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488332/normal_5fd1c29abc10a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466154/normal_5fd073ae7abae.pdfIn PDF document text
    • http://future-techno.ru/why_do_i_feel_full_every_time_i_eatls9l5.pdfIn PDF document text
    • http://leadtop.co/how_to_critically_analyse_a_journal_article_examplel9l3e.pdfIn PDF document text
    • http://[router_ip_address]/cgi-bin/;uname$IFS-aIn PDF document text
    • http://[router_IP_address]/cgi-bin/;killall$IFSIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_c9debd1b9eb34654b24533ca5788c30d.pdf?index=trueIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_9bbc9c2316c444aa8eeb44c376014c62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a1f38db-1b37-434c-8285-109b4716194d/dibafunojapuresodovokiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af6c4a10-e73a-4d06-afe1-07ff78db2414/blackmagic_atem_switcher.pdfIn PDF document text
    • https://ebd157e6-94c3-4ff5-b3ab-516f87acbde6.filesusr.com/ugd/e87473_b9f8966c792d459d868b87c2950d8ad0.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_5dbc221acaee412ebb83891fcfbcfded.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4414820b-6174-44bb-9e49-f2c6a165251e/what_does__mean_on_instagram.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_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 5360 bytes
SHA-256: 3b50c78b61223a065c9a91c3bbd763dea3d1fadea2775e1a31fe091d7a49f110
font_01_sfnt_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 1796 bytes
SHA-256: f0003c945f3029c50f48e92ba01a0e33a74c43bcf56d6d6fc3739bb7286b6023
font_02_sfnt_off000106a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 11016 bytes
SHA-256: 749ecd3f0f13aea19e0e4e2b647473b5bd452ff09d474265c287220b3a7a62e4

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