Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f4b66be063cbe4…

MALICIOUS

PDF

80.6 KB Created: 2021-04-06 19:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 416e6254c33ae5ac983925794aef403c SHA-1: 55bedd68f630cdcc3e1bd25aa10a5da9a14d7381 SHA-256: 06f4b66be063cbe45cc5dec07dbcf7e198333373f014676fa9dd1ab30e9c39a5
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 0.9991

Heuristics 6

  • 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.
  • 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://fokemale.ru/123?utm_term=invigilation+timetable+template PDF link annotation
    • http://ch-data-2a8fv9s.pw/9831804637r4s92.pdfIn PDF document text
    • https://rozinezo.weebly.com/uploads/1/3/1/6/131636990/94d2b43f31ea44.pdfIn PDF document text
    • https://fatuzolawodazu.weebly.com/uploads/1/3/4/7/134730183/gibasamuke_podugawuveteva_vadawalawekusa_mititirezuded.pdfIn PDF document text
    • https://warodimaziwini.weebly.com/uploads/1/3/4/6/134611971/gofuwexevawikit-vomivu.pdfIn PDF document text
    • http://my-favshop.online/medical_microbiology_textbook_free5709f.pdfIn PDF document text
    • https://jolovezenokomo.weebly.com/uploads/1/3/1/3/131398109/e2fd09.pdfIn PDF document text
    • https://xalojuxovev.weebly.com/uploads/1/3/0/7/130774978/499b5.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/1bc9daa7e0b589b.pdfIn PDF document text
    • http://lojisaka.22web.org/red_black_white_wallpaper_free.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/17fa8d6.pdfIn PDF document text
    • http://simcars.ru/pathfinder_cleric_feat_guide3gg4t.pdfIn PDF document text
    • https://zawawileniweja.weebly.com/uploads/1/3/5/3/135317922/7239879.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lulikeleweworup.epizy.com/21023012015.pdfIn PDF document text
    • http://padubarejibuso.rf.gd/56527792399.pdfIn PDF document text
    • http://gogidovegesoxe.epizy.com/61791344799.pdfIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_3f34b93cb72c47e0a51a6dae572d61c3.pdf?index=trueIn PDF document text
    • http://kexofiz.epizy.com/batman_killing_joke_movie_reddit.pdfIn PDF document text
    • http://takamuwemevofe.epizy.com/chloroplast_structure_and_function_coloring_answers.pdfIn PDF document text
    • http://luvibiw.epizy.com/7037327482.pdfIn PDF document text
    • https://b634734f-67aa-4edc-9b69-dcf7610e4690.filesusr.com/ugd/c86859_0137f4f96b1e485e8cb8abc8a5763e08.pdf?index=trueIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_643343ad6b1b4bac848fa4b6256d6034.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_4fe28c07d61f444d92b34bddba147691.pdf?index=trueIn PDF document text
    • http://jipobemimojogot.rf.gd/24677302541.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_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 5000 bytes
SHA-256: d40d36dd683f6215d0c3e67b353013b5086a8fc0e4d6e41b95d22e6c921d7cd0
font_01_sfnt_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 10748 bytes
SHA-256: 63b8a01aa8dd8e86e5883ec5fab9f5b16dcfab52642f6744bfffa5092da3537d
font_02_sfnt_off00011cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDB 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939