Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c05f7fe04e7ab7…

MALICIOUS

PDF

74.1 KB Created: 2021-04-01 17:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8375b8f9e79994e8de4d0c139d14f9be SHA-1: 9c4cc63abc27164f9328a486f8c8efb10eeabab8 SHA-256: 54c05f7fe04e7ab799080075070938a18227f97f315b8bc043ef9b92df9e1a87
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to deceive users. The presence of a 'download' button lure further supports a malicious intent to trick users into clicking these links. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/award?keyword=broadcast+news+movie+script+pdf PDF link annotation
    • http://letonibi.iblogger.org/navy_advancement_center_cpo_results.pdfIn PDF document text
    • https://pibowalemarume.weebly.com/uploads/1/3/1/1/131164440/3048667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493876/normal_5ff1e6dba0deb.pdfIn PDF document text
    • https://wovofonunubani.weebly.com/uploads/1/3/1/4/131408017/vomonareg.pdfIn PDF document text
    • http://fovejawurolugaf.iblogger.org/classes_of_phylum_chordata_and_their_characteristics.pdfIn PDF document text
    • https://tobivuzulukimu.weebly.com/uploads/1/3/1/3/131384599/4180006.pdfIn PDF document text
    • http://ekzo-fruit.ru/libro_de_los_muertos_egipcio_completo4qmqi.pdfIn PDF document text
    • http://sweetygirl.club/13646723108i286x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452385/normal_6042062e52ed9.pdfIn PDF document text
    • http://wemexuj.22web.org/circumcenter_and_incenter_maze_answers.pdfIn PDF document text
    • https://zopixidasopotid.weebly.com/uploads/1/3/1/3/131397955/9473553.pdfIn PDF document text
    • https://verefatodefi.weebly.com/uploads/1/3/4/7/134722939/3114937.pdfIn PDF document text
    • https://tewukowil.weebly.com/uploads/1/3/2/7/132741555/3da4bb06b19ed.pdfIn PDF document text
    • https://wusitezuredov.weebly.com/uploads/1/3/5/3/135314125/ee5e9cd5.pdfIn PDF document text
    • http://nadahul.ru/life_cycle_of_a_plant_ks2_worksheet4j5pp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fadirejanebebi.epizy.com/96410918461.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_0a17ce70d6ec45179ecb379de4de053c.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_cc9567b6743c44049f7b150b28edbb0a.pdf?index=trueIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_ba4277f213d24c20910db6967f91adfa.pdf?index=trueIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_cb79628962f54bdfbcc8cd1eba877d48.pdf?index=trueIn PDF document text
    • http://fegupiwum.rf.gd/basic_and_clinical_pharmacology_katzung_11th_edition.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_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 5472 bytes
SHA-256: 26c89918466173e9a2ffb2052fac47a87c51952eade86cb22ae16e8fe271db40
font_01_sfnt_off0000f1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 11616 bytes
SHA-256: 62b05347db752d4ddcb734955fc75f561785c10a8c7a87c0388bfaee7a9d7370