Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfea6275500c4e0…

MALICIOUS

PDF

83.2 KB Created: 2021-04-23 20:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6993e1feb2fa680fad3882e9074ecc63 SHA-1: f6f7bf28e729a659777a671d1e0522e12dbfeb58 SHA-256: ddfea6275500c4e0b6b659636f1e4d54df092475aba32a2b0c4e4e961f2897a3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to software and search terms, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=propresenter+6+problem+communicating+with+songselect PDF link annotation
    • https://cdn.sqhk.co/mowezeto/idlwiaB/24196038005.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/buvima.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/word_by_word_urdu_translation_of_quran.pdfIn PDF document text
    • https://cdn.sqhk.co/neguvobipa/iahi3gc/graco_airless_tip_selection_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/kQjbjsD/calendar_schedule_planner_appointment.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/gg1atfn/mobile_phone_sim_cards_explained.pdfIn PDF document text
    • http://mejumafegebameg.mygamesonline.org/9662899230.pdfIn PDF document text
    • http://zetumitufam.mywebcommunity.org/mimo_antenna_design.pdfIn PDF document text
    • http://ginixotojaru.medianewsonline.com/juzevetenum.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/ghfgdpe/27852508307.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/nexekuluniradubomedojuxu.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/9cld4VZ/flipgrid_approve_videos.pdfIn PDF document text
    • http://mekapidi.medianewsonline.com/calendario_festivos_colombia_2020.pdfIn PDF document text
    • http://merokomazojewi.scienceontheweb.net/66582562824.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/GijCitR/we_heart_it_app_apkpure.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
    • https://uploads.strikinglycdn.com/files/46aa3691-6830-4a74-a499-2690ec999c5b/physics_book_in_hindi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/613ac703-6059-4fd7-820b-27998d004e28/nojirudewitidonebek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0feeaed3-4779-4e9e-b4ed-313bb434f562/wunujudib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6048b281-da10-4b59-a894-216754b623f7/xubawivif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0280c61-39f5-49e1-a34a-da65ca82fd5d/afterglow_ag9_wireless_headset_instructions.pdfIn PDF document text
    • http://fuvamawijivef.atwebpages.com/making_biscuits.pdfIn PDF document text
    • http://zerowegujij.onlinewebshop.net/76256983442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04fbc5aa-d84b-45e3-bb09-84ebdcac9518/can_you_tell_me_about_yourself_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db50de6-d3cd-452a-a732-1dfea63b103b/united_states_army_symbol_meaning.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_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 5616 bytes
SHA-256: 3553a5e3e6ed692194354d250057bede33476cdfcc0ae2af84c50bb0d3306db5
font_01_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 11080 bytes
SHA-256: b19ddf4e9c943c92edfe6e0269f0c91c9beaa0096c88c1f762e6437338819201
font_02_sfnt_off00012ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333