Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac73a6e966cb3473…

MALICIOUS

PDF

77.7 KB Created: 2021-04-03 22:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0acb796e6cc75ba7c3d6054e29e17e09 SHA-1: 27917f1faa1694253b92603febbdb462ecd2a5b6 SHA-256: ac73a6e966cb34737ddc4b3466c95d5f40067170c0c8a5eada32e49c8739bada
244 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable hosting, with several pointing to known malicious redirectors. The document body, though heavily obfuscated, suggests a lure related to 'Attacking network protocols pdf free'. The 'SE_SECRET_RECOVERY_LURE' heuristic indicates the document likely attempts to trick users into revealing sensitive information like private keys or passwords. No scripts were extracted, but the overall structure and heuristics strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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://dafemum.ru/award?keyword=attacking+network+protocols+pdf+free In PDF document text
    • http://gixapovunugu.getenjoyment.net/automatic_bottle_filling_system_using_plc.pdfIn PDF document text
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/mojolejoluxupukesut.pdfIn PDF document text
    • http://feziweninepiv.iblogger.org/73745564306.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/70411852167.pdfIn PDF document text
    • https://nidarefazumeb.weebly.com/uploads/1/3/4/7/134748986/zidavawatudojokisi.pdfIn PDF document text
    • https://gawobomune.weebly.com/uploads/1/3/5/3/135317514/vimesok.pdfIn PDF document text
    • http://ferunasivagu.iblogger.org/technical_drawing_software_android.pdfIn PDF document text
    • https://juxufosuzuvol.weebly.com/uploads/1/3/1/4/131437906/9dec9842dd42af5.pdfIn PDF document text
    • http://kifisafobubupo.mygamesonline.org/dalabanumix.pdfIn PDF document text
    • http://bitopikagigev.iblogger.org/vubolalerewaveno.pdfIn PDF document text
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/zafedewakovonisi.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/american_assassin_books_in_chronological_order.pdfIn PDF document text
    • http://bemijaragilez.22web.org/money_word_search_answers.pdfIn PDF document text
    • https://lakafoxure.weebly.com/uploads/1/3/4/2/134266374/4419841.pdfIn PDF document text
    • https://rogosibaf.weebly.com/uploads/1/3/4/5/134590501/jokat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bilunijo.epizy.com/57810982569.pdfIn PDF document text
    • http://xezaretidatoro.onlinewebshop.net/falcon_bms_4.35.pdfIn PDF document text
    • http://ruzisir.epizy.com/this_is_amazing_grace_song_select.pdfIn PDF document text
    • http://kegonen.rf.gd/xotogugemabebolapezof.pdfIn PDF document text
    • http://lexekuduwowig.atwebpages.com/catalog_of_federal_domestic_assistance.pdfIn PDF document text
    • http://zirugobaxunorix.epizy.com/87901301013.pdfIn PDF document text
    • http://puwekaxaxowiza.epizy.com/69304600942.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_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 5256 bytes
SHA-256: 1c63d8f9cef61270c4663a5baca3f4b6e1bfb1633d0127bcaade9b4e057b8174
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 10208 bytes
SHA-256: 15e92beba6ee62f11932084fcfa63e186c34f88713787839b336c46b1ff4798b
font_02_sfnt_off00011b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f