Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b48972876e318b1…

MALICIOUS

PDF

85.6 KB Created: 2021-03-29 09:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 002121359c8ac393fe36bdde7fafad8e SHA-1: 7ff922467409f5c1aa31ca4b95877b6b29dc84a3 SHA-256: 6b48972876e318b1b638a2649a3809ff743dd83ef55ec68144850833d746bd44
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm designed to direct users to various external PDFs. One of the primary external links, 'https://gimoguvi.ru/strik?utm_term=famous+dave%2527s+rib+nutritional+information', is suspicious and likely leads to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/strik?utm_term=famous+dave%2527s+rib+nutritional+information
    • http://fituxem.sportsontheweb.net/world_map_continents_black_and_white.pdf
    • https://cdn.sqhk.co/nonuripot/fighjih/real_bus_driving_simulator_game_download.pdf
    • https://cdn.sqhk.co/sudizatase/hhhaidL/38905126944.pdf
    • https://kutofepiv.weebly.com/uploads/1/3/4/8/134898103/zapemukovefuwed.pdf
    • https://cdn.sqhk.co/biluvetizom/cgdijp3/spinner_gun_targets.pdf
    • http://jalazekesofijot.medianewsonline.com/is_sat_required_for_class_of_2022.pdf
    • https://tazusovekofuwaj.weebly.com/uploads/1/3/5/9/135969448/3358784.pdf
    • http://bixesifebara.iblogger.org/how_to_put_a_400_day_clock_in_beat.pdf
    • https://cdn.sqhk.co/befozaxulot/dmV9hes/23958783716.pdf
    • http://motozed.scienceontheweb.net/dejekasajobujajowa.pdf
    • http://budivev.scienceontheweb.net/simplemente_inolvidable_mary_balogh_descargar.pdf
    • https://cdn.sqhk.co/letarezetap/CqLhfN7/localizar_mi_android_por_gps.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dipafuxe/chinese_elm_bonsai_care_guide.pdf
    • https://s3.amazonaws.com/pegebunov/cursive_handwriting_sheets_alphabet.pdf
    • http://disoluje.myartsonline.com/jspdf_autotable_docs.pdf
    • https://s3.amazonaws.com/woxorojero/mikad.pdf
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_d427c58826cb426cad5eeb105aa8f483.pdf?index=true
    • https://s3.amazonaws.com/xovekolamoxe/what_are_the_top_biggest_fears.pdf
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_457af3379c094f5d80f7a41c59e0a5a3.pdf?index=true
    • https://a0758896-f8c2-4fc9-8c7e-5c1738e8bc18.filesusr.com/ugd/0ce882_150bb1367072428aae2712574f601ca0.pdf?index=true
    • https://s3.amazonaws.com/rejiner/25136365881.pdf
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_6f985749b5bd4e388bd6e63fb5d65d9a.pdf?index=true
    • http://gasigigi.rf.gd/dominion_blue_book.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_off000111b0.bin
4b3f52a4707fa39753b35d0cbd7976edc1e03b112b5fd81089ecccc22b4ba62d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 5244 bytes
font_01_sfnt_off0001237c.bin
5f019010418b1e0e6737dce37b5dae17d2044ae351819ddb9b5c9e5085b32ed3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 10980 bytes

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