Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1be71159844132a…

MALICIOUS

PDF

121.1 KB Created: 2021-03-24 02:00:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fc0b4a525f22963755a6f6dce6e5dd77 SHA-1: 2ba1dc29794f9fe7b80b47af726032b27a82740f SHA-256: f1be71159844132a25993bccf2784024da07cfe85561842b927198dc247a734b
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior. While no scripts were directly extracted, the presence of external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=barron%2527s+ap+calculus+13th+edition+pdf PDF link annotation
    • http://fidafevemikiwe.mywebcommunity.org/how_many_carbs_in_two_hard_shell_tacos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411922/normal_604632f8090e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405202/normal_5fc85f044b854.pdfIn PDF document text
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/misudetora-nuninikefim-vuxuvevomel.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/simile_metaphor_and_personification_online_quiz.pdfIn PDF document text
    • http://astrology-personal.online/fizulapetakinitirodedufn00rf.pdfIn PDF document text
    • http://lamovingcompany.com/how_high_to_set_game_camerauo76v.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/ronorexoliginapubokuwa.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/ti_nspire_cx_cas_software_free.pdfIn PDF document text
    • http://kegetisa.mygamesonline.org/1000_words_english_to_arabic.pdfIn PDF document text
    • http://xakaderinetatu.mygamesonline.org/fugukemorulipevenumijub.pdfIn PDF document text
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/535333.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/how_to_find_the_choke_price.pdfIn PDF document text
    • http://sokobumoxagug.scienceontheweb.net/pugekekosofup.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/1bee3fec-8072-4bfd-8338-57897f153a63/poritidate.pdfIn PDF document text
    • http://suvalomimo.atwebpages.com/47230931283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e989f3c-82a0-4fc4-b381-2fbe81ac6a9f/71418614916.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 42452 bytes
SHA-256: 15de2e126194003430809f798ed4d3f8c2bed6852f907abf080f6a4ef1e831b5
font_01_sfnt_off00018277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18277 5544 bytes
SHA-256: 7e11226d09033dbf46bb22ed76e00cd32272d33a8d66114e78293b60606d640d
font_02_sfnt_off00019555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19555 12444 bytes
SHA-256: 318e8d22396a78f4b80f628ec7d648078ea1d642a9a6227bfd43321fa9134964
font_03_sfnt_off0001bf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF97 16160 bytes
SHA-256: 71fec8a3adfe41455811528c654ef740a0d97889ddd19e39e153b04b7507b7f0

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