Malicious PDF — malware analysis report

Static analysis result for SHA-256 690aa4dfa23e6735…

MALICIOUS

PDF

77.1 KB Created: 2021-03-19 04:52:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 12d9bee1c6e419a484aa823411d531d1 SHA-1: 70115270c2ffd31dfa8ba5d3b73107dee41860dd SHA-256: 690aa4dfa23e673576104b16ee053186433af6395545c3c44009eabc6fc3f584
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm point towards an attempt to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dugedepap.ru/wix?keyword=blue+pelican+java+answer+book+download PDF link annotation
    • http://bibuzikufaje.mygamesonline.org/japididezivurinabi.pdfIn PDF document text
    • https://devanuwi.weebly.com/uploads/1/3/0/9/130969177/zafiwizute-rasim-wosajeninetileg-potezowuwapuve.pdfIn PDF document text
    • https://cdn.sqhk.co/fapulatonupe/Vhii03J/sepizevedixobogiz.pdfIn PDF document text
    • http://jizerigozigalav.getenjoyment.net/zadero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386335/normal_60287014f3787.pdfIn PDF document text
    • https://pagafamowadaf.weebly.com/uploads/1/3/4/8/134878907/23db22d36ced.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482617/normal_5ff7f00e87193.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/e7Shezn/12948741734.pdfIn PDF document text
    • https://muzaromiv.weebly.com/uploads/1/3/4/3/134380281/7225e67fa5b7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_60490f633ab75.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/diiiakN/5534986681.pdfIn PDF document text
    • https://tasikedojawepu.weebly.com/uploads/1/3/4/4/134473564/tirapoxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374686/normal_5feb0d7b7eca4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423431/normal_5fef6d027b5f0.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/how_to_set_up_bowflex_ultimate_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_3f49a12a1e0f459da22dbc594739a0e2.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_a755403945e0443c9f8de429bda0c643.pdf?index=trueIn PDF document text
    • http://murapimopavopa.myartsonline.com/wibimerete.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/what_is_the_study_of_the_solar_system_called.pdfIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_038f5f45f9b04311838dacb624c1eb88.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/ace_stream_on_sony_android_tv.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/calendar_2020_june.pdfIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_f611110ea9be4998a176cd24f9aaac18.pdf?index=trueIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_b271f708dcde4550a276954266707601.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/79718778065.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_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 5548 bytes
SHA-256: 91a22b1b6c98992a9e22e09f602a87a564a988e985a9ad6e5a86946f8efd12cf
font_01_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 13680 bytes
SHA-256: 8cd59f4c794e7c2109f6908dbc9ad30fd13a98a9559b4d21c465d850dae06357