Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85a54d9783c5628…

MALICIOUS

PDF

88.9 KB Created: 2021-04-17 22:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 62f2598a5da8193510c1c415f7ebfc72 SHA-1: 3d51dcd145a51ac3350ad0692be8d0d1de5ace88 SHA-256: a85a54d9783c56282405726f136109223603135e7401193d2cf946abc5acd87e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/strik?utm_term=statistics+and+probability+basics+mcqs+pdf PDF link annotation
    • https://dudunubute.weebly.com/uploads/1/3/4/1/134132035/pemifigidem.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/geghXhf/guwapuluzujolatinagusif.pdfIn PDF document text
    • https://cdn.sqhk.co/kejopala/PjaQGij/regetasojunuluvokaxisin.pdfIn PDF document text
    • https://ravikuzisuwu.weebly.com/uploads/1/3/4/4/134470025/a91c0801f2.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/yTjigcH/oakwood_movie_theater_hollywood_fl.pdfIn PDF document text
    • https://cdn.sqhk.co/dapubebireba/ChcqgeL/wazegolopepidop.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/tHMnOhe/todolist_abstractspoon_theme.pdfIn PDF document text
    • https://pulapafux.weebly.com/uploads/1/3/0/8/130874232/wajosimigoz_dejuviloluko.pdfIn PDF document text
    • http://baditunabupiru.mywebcommunity.org/character_design_sheet.pdfIn PDF document text
    • https://jizetexosobuwek.weebly.com/uploads/1/3/0/7/130740437/8978a3d5514df.pdfIn PDF document text
    • https://wikivosunox.weebly.com/uploads/1/3/2/7/132741322/vagisarazamawa-nexupakoj-lopepagekaxa-jagajipaf.pdfIn PDF document text
    • https://livaruzurakit.weebly.com/uploads/1/3/4/4/134432061/wofavatewewimaka.pdfIn PDF document text
    • http://rivokalodusi.sportsontheweb.net/anatomy_of_spinal_cord.pdfIn PDF document text
    • https://mojogobiwed.weebly.com/uploads/1/3/4/7/134747953/pubid_jedubakida.pdfIn PDF document text
    • https://nebuxegakox.weebly.com/uploads/1/3/4/4/134404726/zogepasudizubiz.pdfIn PDF document text
    • https://tigoxugijiwubaz.weebly.com/uploads/1/3/4/3/134315710/5503497.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c0e102b-efba-4641-b7fc-347c26357927.filesusr.com/ugd/d420ee_c333f0556a9146fea9965f26a354ee63.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/hurt_me_once_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/bsc_part_2_mathematics_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/wawikuripowan.pdfIn PDF document text
    • http://fugufaza.myartsonline.com/pax_s80_pin_pad.pdfIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_fb67c6cb7f9c4989b17f2daeea9c6721.pdf?index=trueIn PDF document text
    • http://satawakerexe.atwebpages.com/longman_academic_reading_series_5_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/58241563479.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/fire_risk_assessment_template_for_manufacturing.pdfIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_ac60e4b9c8cb44b48d924b650e9df217.pdf?index=trueIn PDF document text
    • http://dirulibas.onlinewebshop.net/30748475386.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_off00011cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC9 5772 bytes
SHA-256: 15d321a6415f494c3a28df5dd3959509e241ea9ecd71dc5a9d349d157d09ca11
font_01_sfnt_off00013055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13055 10768 bytes
SHA-256: 867e2749d6001fbf2905455b7241191b3963838749ecbcad94e1e233b0e83871

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