Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d262c2ec513fd2…

MALICIOUS

PDF

89.4 KB Created: 2021-04-01 14:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9c9de97f7c550315232b60b96497beb0 SHA-1: 54ef46cf24182e135e605da8ecb460ad7226f647 SHA-256: 73d262c2ec513fd2d0b8b3f9ad799d33eb32c5907fd3f27da4ae244330d20feb
186 Risk Score

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://dugedepap.ru/123?utm_term=cisco+3850+24ts+datasheet PDF link annotation
    • https://zalirojojates.weebly.com/uploads/1/3/4/6/134606979/teleranibum-vivitid.pdfIn PDF document text
    • https://fuwupizur.weebly.com/uploads/1/3/5/3/135390256/b8c579d15a3af.pdfIn PDF document text
    • http://raisinshub.pro/fixasamakimikawotusowisij5wn8.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/matafubulumamaluwopivilat9es.pdfIn PDF document text
    • http://testvvd.xyz/how_do_you_write_a_good_self_evaluation8qxjd.pdfIn PDF document text
    • https://fuvenaxumegiga.weebly.com/uploads/1/3/3/9/133999500/fatorotobabezasab.pdfIn PDF document text
    • https://resevaguwitim.weebly.com/uploads/1/3/5/2/135298688/2e4d602f950fbb.pdfIn PDF document text
    • https://xijiruxexewige.weebly.com/uploads/1/3/4/7/134725886/zuwapatisolarovewori.pdfIn PDF document text
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/vuwubujabuxag.pdfIn PDF document text
    • http://ericksandoval.com/action_for_2-_4_players_pro_mod_apkeoxbt.pdfIn PDF document text
    • https://xudomulur.weebly.com/uploads/1/3/4/0/134040538/f1b8ed6b.pdfIn PDF document text
    • https://nezivubu.weebly.com/uploads/1/3/1/3/131384481/1792467.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gavenivifi.rf.gd/duwojoredafovazakamava.pdfIn PDF document text
    • http://folizel.epizy.com/couchbase_java_client.pdfIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_7acb4a7097894e718239385274ecf6bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dupula/convert_xls_to_multiple_sheets.pdfIn PDF document text
    • http://fujexineduronas.rf.gd/raterisifezapaguma.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/airplay_mirroring_for_android_tv.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_4cca22c7e9c9416daa96042fa47f9577.pdf?index=trueIn PDF document text
    • http://sowezenuvafe.epizy.com/just_listen_to_your_heart_quotes.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_off0001094d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 5648 bytes
SHA-256: 5c9f225c5b7997068946c5d705423f64043cb5e21021ff1b15e157a4540e1a07
font_01_sfnt_off00011c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C90 10956 bytes
SHA-256: 8f4d08e004ece2f7a0f7acaaeaf70f86a45c9bed1b7dd80c6c76ae4e5b26ec70
font_02_sfnt_off00014210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14210 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90