Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a2491c17ee193c…

MALICIOUS

PDF

82.3 KB Created: 2021-04-26 08:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 70acce715def398fc55972c85942eebb SHA-1: 2cd1e173e13adab8500896646e378f21de98fc73 SHA-256: 39a2491c17ee193c08bbc61076e3d139d5b68bf174e76c40300670973e5d481b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF structure itself are indicative of a malicious document, likely used as a lure to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/strik?utm_term=reset+drum+counter+brother+tn-420 PDF link annotation
    • https://buxudirikebipur.weebly.com/uploads/1/3/1/1/131164004/jinukawi.pdfIn PDF document text
    • https://mutovowi.weebly.com/uploads/1/3/4/8/134862221/8ae4562064a.pdfIn PDF document text
    • https://cdn.sqhk.co/bomaguvodar/ichiMYT/faustformel_reaktionsweg_100_km_h.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/zJCJgcE/sawusubabomimubasobome.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/kujagid.pdfIn PDF document text
    • http://judifino.iblogger.org/nanovurata.pdfIn PDF document text
    • https://cdn.sqhk.co/besewixogiv/crPjiRr/canine_adenovirus_type_2.pdfIn PDF document text
    • http://xasodizuloled.iblogger.org/xujabe.pdfIn PDF document text
    • https://cdn.sqhk.co/fufowomusixi/afxiaij/filling_small_holes_in_sheetrock.pdfIn PDF document text
    • https://zebatezovas.weebly.com/uploads/1/3/4/6/134618099/6051685.pdfIn PDF document text
    • https://tijoteveduno.weebly.com/uploads/1/3/4/8/134853829/besorefotu.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/mobujemagokoxikawakumusa.pdfIn PDF document text
    • https://vetafewilede.weebly.com/uploads/1/3/1/4/131408572/gutatopuxu-kusesupevawibi-besovafep.pdfIn PDF document text
    • http://vebifitapex.mypressonline.com/how_much_to_replace_highlander_hybrid_battery.pdfIn PDF document text
    • https://ridegagix.weebly.com/uploads/1/3/4/6/134668883/7516158.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e13ed7c-7576-4908-978f-be7d49e4ba36/radio_shack_pocket_digital_multimeter_manual.pdfIn PDF document text
    • http://fajazimigig.atwebpages.com/ayurvedic_books_in_kannada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb15240-343b-4a51-85be-edd6309c6294/walmart_newborn_girl_clothes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0745b817-071b-4e76-80a0-31b50d4f3bc0/91617352052.pdfIn PDF document text
    • http://wubojupegija.rf.gd/kimeguxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08dcee53-34c9-4d69-86c0-b362f243067f/mupizaxufi.pdfIn PDF document text
    • http://ritajegowi.epizy.com/heroes_of_the_enlightenment_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1da990f-a202-478c-9364-f451d4f4ceaa/mercruiser_4.3_tks_service_manual.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_off00010154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 5476 bytes
SHA-256: bd4584ab3fe685889d59f891ccad1cbbca31018211e572733c7d1a36863a28b8
font_01_sfnt_off000113db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DB 11584 bytes
SHA-256: 557053ee707183c76faf84082460ab2f6887c6f44e992d1abfe73e4a1a5eed5d