Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d9f96f386ec4fe…

MALICIOUS

PDF

82.8 KB Created: 2021-04-06 12:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: a6a5b0e80385095e682fa42939927b20 SHA-1: 80860e05f7f3cc6e1dd4bb39f1bb9e3709c1bf82 SHA-256: c9d9f96f386ec4fe684167e516c837e6a59b50b6ca727b94e40ee7f7a79fc734
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links, some hosted on disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xajibur.ru/strik?utm_term=how+to+use+last+fm+with+apple+music PDF link annotation
    • https://dufavepuxafolim.weebly.com/uploads/1/3/4/2/134266173/fedd9aced.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/jMUgnmC/4227977719.pdfIn PDF document text
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/8055672.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/jbIjaHy/81606102853.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/jeuiaV4/telugu_audio_bible_new_testament_free_download_mp3.pdfIn PDF document text
    • https://sudirunerobup.weebly.com/uploads/1/3/4/8/134877260/nizerenidemufo-xefoj-kavifemazuki.pdfIn PDF document text
    • http://wigogaduxatinuv.iblogger.org/html_template_responsive_gallery.pdfIn PDF document text
    • https://zupevinar.weebly.com/uploads/1/3/0/7/130739631/vururawebejug.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/rgiiggj/podcast_downloader_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/jcSibhd/51530493211.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/7791816.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/176f0df9-78f6-49d4-89d1-a8db4d985508/isaac_asimov_foundation_series_book_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8252c645-9c09-4370-8874-9230cad9872b/geveko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6348818f-83dd-4b7d-a66f-10f51377e0e6/how_to_write_computer_code_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57d6748-6fb2-4062-b9db-aa7c06379ae9/57982543277.pdfIn PDF document text
    • http://botuwosolu.rf.gd/sumif_true_google_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a87471e-d759-4b2a-84c0-e97f352bc71f/tumafevex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c870d5c-8008-4f44-bc98-cda9f20eb4d7/womonesapov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/689dd8a0-1a9b-4958-a752-375048cab9e1/78164959492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fb3a91-db63-4ab0-9591-277f416a423a/junot_diaz_this_is_how_you_lose_her_excerpt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e5c131f-a039-45e2-90e1-67aabfe7a5c9/2008_ford_explorer_transmission_replacement_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b4500db-633f-48e4-b228-6ca4fcd91bd8/how_to_disassemble_jack_lalanne_power_juicer_without_crescent_tool.pdfIn PDF document text
    • http://bevamixebigal.epizy.com/fluke_test_report.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 5212 bytes
SHA-256: 217c6cd841f505c09940191a688836c7c7e21cdacbe5367b4718a1922c6691f4
font_01_sfnt_off000117dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DC 11216 bytes
SHA-256: af37c98a88b2382e2af82142e38565c5d79221b04547a1b33045050416e2937f