Malicious PDF — malware analysis report

Static analysis result for SHA-256 572b372fdbb1860c…

MALICIOUS

PDF

76.5 KB Created: 2021-06-02 11:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 392da34e10dc62d258e9ad87f26f11c9 SHA-1: 65fede4164fa9d01a09700694fff759b8a4018bd SHA-256: 572b372fdbb1860cf609c488b1c661d4e30bdf42fbe9562995e855c1e3fc97f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://leonvi.ru/123?utm_term=la+la+land+epilogue+sheet+music+easy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420612/normal_603eaa5246505.pdfIn PDF document text
    • https://kimonasisu.weebly.com/uploads/1/3/5/4/135400987/fuxaget-lapamaparusuxu-barino-baxezow.pdfIn PDF document text
    • https://zofenegug.weebly.com/uploads/1/3/1/6/131636866/piwot-fatakeg-pusogufulok-vumijovi.pdfIn PDF document text
    • https://nazisedisan.weebly.com/uploads/1/3/1/8/131871674/3190870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369158/normal_6063765318818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_602283110f121.pdfIn PDF document text
    • https://guxovixig.weebly.com/uploads/1/3/5/3/135317997/datidanimux.pdfIn PDF document text
    • https://xufevojulan.weebly.com/uploads/1/3/1/3/131384667/339e5eb4ddf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454051/normal_5fe6aabc8302e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392658/normal_604fc8c11c484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420775/normal_600d28515b536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_6021964b161c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144451941/wugijozimibopuxikuke.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/xefow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7d564d-7108-4623-b861-0ecc43337d50/vovixixisolode.pdfIn PDF document text
    • http://xawaren.pbworks.com/w/file/fetch/144418098/car_interior_3d_model.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bfca7d5-a817-4de6-96ef-178de3f1231a/51120962162.pdfIn PDF document text
    • http://jizakatum.pbworks.com/f/a_good_way_to_reinforce_the_central_idea_in_the_conclusion_of_your_speech_is_to.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/w/file/fetch/144485193/modewopopifivezegilak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f113f969-5525-4b45-b967-7d55b00cc4a2/universal_laser_vls2.30.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144411861/buposewetibezis.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/f/rewrite_the_following_sentences_into_negative_and_interrogative_form.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144423276/sejitisurifiron.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144426798/8823306598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3351652e-1276-46e5-a872-2566e5f65033/48671449761.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_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 5436 bytes
SHA-256: 8971f5add6901c9a1ca0ad75b2eacfe12a4b577071c04045acbaede97338b2ec
font_01_sfnt_off000100ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 10476 bytes
SHA-256: 2905f9c8a15eaed49ba630ec79f8da427bf2162d6997b3ea3ec8ab30af2dddb6