Malicious PDF — malware analysis report

Static analysis result for SHA-256 603539f16e7e5138…

MALICIOUS

PDF

78.0 KB Created: 2021-06-05 16:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5b7b1156b4f481c68270a774cc4aa831 SHA-1: e8d167ce02f2bcb49dc1413f690fd84eedbdb87a SHA-256: 603539f16e7e5138d65ed43e560f89075926f0bd21d0baf8f5cd437aad6d2302
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting or domains associated with link farms, indicating a malicious intent to manipulate search engine results or host malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. While no scripts were extracted, the structure and URL patterns suggest a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/pbw?utm_term=bible+reading+plans+for+engaged+couples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5fe9cbc6c6ef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_6069f35da7eb6.pdfIn PDF document text
    • https://wotuterivakevom.weebly.com/uploads/1/3/4/6/134608936/090eb4578d600f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406191/normal_604690ad59a7f.pdfIn PDF document text
    • https://wufenimikefi.weebly.com/uploads/1/3/4/3/134366244/zunidov.pdfIn PDF document text
    • https://rigafimer.weebly.com/uploads/1/3/4/9/134901715/penowadomunak_xuzafisexirafe_jelutulage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419849/normal_60445c17ca0e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469828/normal_5fda3e7714241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5fd7edf49ca54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482402/normal_6052fd88741f8.pdfIn PDF document text
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/zuzibir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459939/normal_5fdd317536697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_6047ebe185a84.pdfIn PDF document text
    • https://kubuwexujilo.weebly.com/uploads/1/3/4/4/134473085/mibesofatasev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377905/normal_6001d853678fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417315/normal_60638e4818d4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fosirodovo.pbworks.com/w/file/fetch/144439344/how_to_enter_likert_scale_data_in_spss.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/f/zofalav.pdfIn PDF document text
    • http://pitavumiza.pbworks.com/f/how_to_reset_a_panasonic_inverter_microwave.pdfIn PDF document text
    • http://namikikis.pbworks.com/w/file/fetch/144635658/cognizant_technical_interview_questions_and_answers.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144424515/8937322884.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/siripelunuletolov.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/w/file/fetch/144466500/how_do_fraction_strips_help.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/w/file/fetch/144461721/34196609649.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_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 5512 bytes
SHA-256: 82a99e444d9d86990b1c87d08d04d40b47f72062864e36ed1fe5771a8d0681d6
font_01_sfnt_off00010602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 10536 bytes
SHA-256: 4e88177f944f186227110c823cc4b587b013e904b1c407f4173ed3c9cb070faa