Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa356b4e629cb5f…

MALICIOUS

PDF

103.9 KB Created: 2021-04-24 02:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b08350f94d6f7fefc4028280d6f98899 SHA-1: 2d83aa6365b6fe117f575c2b44bc7c87d33bb5d4 SHA-256: 8aa356b4e629cb5f1e05b7ef9f7e424cdf37e2cc7d8e950344d705d7097dbd51
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or SEO spam. One prominent URL, 'https://pelibifir.ru/strik?utm_term=what+day+did+school+end+in+2018', appears to be the primary lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=what+day+did+school+end+in+2018
    • https://cdn.sqhk.co/tinupolureg/jchaijO/39014253484.pdf
    • https://cdn.sqhk.co/siboxowimu/eAch7N3/31355497883.pdf
    • http://mixevome.22web.org/burning_wheel_gold_vs_gold_revised.pdf
    • http://fupemagis.mywebcommunity.org/circle_questions_and_answers.pdf
    • https://cdn.sqhk.co/tuwesedujila/hjisDtW/eve_echoes_wiki.pdf
    • https://cdn.sqhk.co/xarozowuzosa/didhfhf/dragon_ninja_2_game.pdf
    • https://cdn.sqhk.co/zoluxoni/JwMhhjf/75580246264.pdf
    • https://cdn.sqhk.co/susorajin/fhbqcRr/22104369142.pdf
    • http://nopotaz.medianewsonline.com/sql_tutorial_free.pdf
    • https://cdn.sqhk.co/rapawaferew/8iidelX/served_meaning_in_marathi.pdf
    • https://cdn.sqhk.co/kevamubeminu/5sgehdV/7474220604.pdf
    • http://rejemezurufoveg.mywebcommunity.org/cancionero_catolico_peru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_1feb85d0866d4d77b5b98cdce68fdbb9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bd768f3f-0f06-401f-9530-631084ea15cb/87069211549.pdf
    • http://jasunusemoki.onlinewebshop.net/kaplan_medical_anatomy_coloring_book.pdf
    • http://nobuxuka.epizy.com/food_handlers_card_answers_az.pdf
    • https://uploads.strikinglycdn.com/files/e965126c-f54e-41b5-ab78-dfcce8e54937/cannery_row_hotels_monterey_california.pdf
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_6fc90982179d4bcf855a01a75e942bcd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/519eedf0-1e3e-4bbb-a957-620b40002148/free_download_game_sword_art_online_for_pc_offline.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001583a.bin
978fb5e6a39f6194acacdaf99d553373854ac931ea5ac8284d5515f77a5e094b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1583A 5564 bytes
font_01_sfnt_off00016b3d.bin
86a4e1a2f43b60293460a78909dc3e199646ff6a8fd3a43a9a06f8359b97083b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B3D 11632 bytes

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