Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ddcfa4a9c92546…

MALICIOUS

PDF

77.1 KB Created: 2021-04-06 09:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b39f31106901914e7936168d8455adf5 SHA-1: c6a2e8b535f2a50f8a90652e1075a3dd7838a5ff SHA-256: 61ddcfa4a9c92546224802c15bd936b572cb545b8564e9d6b9215f78076e8f91
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains text related to a 'study guide', aligning with a common lure for spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/123?utm_term=cset+multiple+subject+subtest+1+study+guide PDF link annotation
    • http://mebovedu.getenjoyment.net/anualidades_variables.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/60371423360.pdfIn PDF document text
    • http://garobunatuxovi.scienceontheweb.net/iit_delhi_placements_2020.pdfIn PDF document text
    • http://mozaduz.mygamesonline.org/yoruba_religion_and_medicine_in_ibadan.pdfIn PDF document text
    • http://viwavidif.getenjoyment.net/lexus_gs_350_f_sport_specs_2015.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/fmHgiie/zasusumesemiwilurutejekod.pdfIn PDF document text
    • https://cdn.sqhk.co/lululitoj/vohgwie/kimuzedakefekebasopibewud.pdfIn PDF document text
    • http://visetazide.medianewsonline.com/banana_fish_manga_completo.pdfIn PDF document text
    • https://cdn.sqhk.co/lonuxonemor/dkgeL0m/airport_praha_arrivals.pdfIn PDF document text
    • http://ribadubeko.scienceontheweb.net/cylindrical_grinder_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/kokedipemi/ojbVpxZ/google_play_games_free_for_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/8mNnH9l/fitness_gyms_iowa_city.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/jdziaT7/verizon_messaging_app_group_text.pdfIn PDF document text
    • https://cdn.sqhk.co/putomikoluku/jagcgd7/super_car_robot_transformer_mod_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/lodupizuna.pdfIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_cf90505aa34a4558a355beca306d1d87.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_4deab1137c28421c87d6f500c9e95419.pdf?index=trueIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_cea8672ac291476481667c10f9e276d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dekogamik/9565090207.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_dc255f37afc64c8b9bf615979aa05104.pdf?index=trueIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_fcde71b61d1a460db80b0cd39be0a1c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeponowon/happy_endings_reunion_streaming.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/48584957003.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 5364 bytes
SHA-256: b206b62e96dfae9b90700c4816025b0db8ce6af86a609ff7511233d40aec4f79
font_01_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 11428 bytes
SHA-256: ab67760586b04a19adba9d5f6ec04ddd3410c80f3803db4c6443b096a9923220

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