Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b16ad7f983937d…

MALICIOUS

PDF

83.8 KB Created: 2021-03-16 21:06:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 151da1c0d533b5983d7f8d83ae3b0822 SHA-1: dde78108989dec97be00c9a62e743a275c0f9af2 SHA-256: 53b16ad7f983937d0886d0e6725a25bebf1f1454e0dbb529d792c9b19570f256
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to a tablet product. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/strik?utm_term=rca+10+windows+tablet+with+detachable+keyboard+w101 PDF link annotation
    • http://xagixowedobosab.medianewsonline.com/verizon_casio_gzone_rock_c731_charger.pdfIn PDF document text
    • https://cdn.sqhk.co/lutotilivik/Ggcgcok/45706483466.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376856/normal_5fcbe5e4f33bb.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/bogimifuroz5xlab.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/how_to_clean_shark_professional_steam_mop.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/f1FicKS/transfer_paper_for_cricut_how_to_use.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489852/normal_5fc597f266848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428335/normal_5ff0118ae5a84.pdfIn PDF document text
    • http://znakomstva69.space/53365413683jwaak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5fd308353cbf2.pdfIn PDF document text
    • https://cdn.sqhk.co/kemomonil/tS6igTd/sedemagurenabudu.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/gCkPxgf/25034525006.pdfIn PDF document text
    • http://bandalet.club/simile_worksheets_2nd_gradew6lb4.pdfIn PDF document text
    • http://best-ital.fun/382950886928gozr.pdfIn PDF document text
    • http://webmastervlad.ru/tell_me_three_things_age_rating99qba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_1915b8564aca44e09de85fd1765a26d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34f48419-8aad-4b22-8a3e-b58aaed2573b/tidesako.pdfIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_b9359a67861945d6bab69012b1f8fa39.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d686163-f8fd-4126-8956-ce259c3dc87a/is_the_bad_boy_zero_turn_a_good_mower.pdfIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_3b053f4dae6f43cd90e562db85ba1a86.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_66db57460cde41af92da6c8e69912f23.pdf?index=trueIn PDF document text
    • http://damowepoko.myartsonline.com/what_is_penal_labour_system.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_d1aa6605305845feb93d8e32b081ca7a.pdf?index=trueIn 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_off00010532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 5624 bytes
SHA-256: 7c95e5458f3e81c4447cc5c5b2e7000f7a3c7cd28fae4e72e3a07735d77d8838
font_01_sfnt_off00011864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11864 11348 bytes
SHA-256: 448b3b5368f2e8f6405fea28de062c2572e342c71db4ac1f589d556033c513fe

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