Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba51ab20928303e1…

MALICIOUS

PDF

73.4 KB Created: 2021-04-01 06:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 104f1aa7dcaac18fd82df426709c8643 SHA-1: 9f6f416701e98cd959fd663049d4bd7dea8cc9fd SHA-256: ba51ab20928303e1f1baf37e78ebfa56590f1f1c4a67b519a773b224bc42e4e3
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to a link farm on disposable hosting, suggests an attempt to redirect the user to malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://nipisod.ru/award?keyword=verbs+and+adjectives+prepositions+exercises+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403260/normal_5fcb012426de3.pdfIn PDF document text
    • http://walefufezaromaj.iblogger.org/gogekiluwagutij.pdfIn PDF document text
    • https://zurukonovode.weebly.com/uploads/1/3/1/3/131379219/gaporaduv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5fefe85edc3ae.pdfIn PDF document text
    • https://sixebujexe.weebly.com/uploads/1/3/0/7/130740217/df6703a3a62a.pdfIn PDF document text
    • https://wuxelulomevadi.weebly.com/uploads/1/3/4/9/134904547/7d65906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_603ca8d3ae502.pdfIn PDF document text
    • https://nivikaxixigimom.weebly.com/uploads/1/3/5/3/135322477/ccc6cea9666565a.pdfIn PDF document text
    • http://discout.online/lefowaranibupc5b81.pdfIn PDF document text
    • http://es50off.pro/80836567410qiwqs.pdfIn PDF document text
    • https://xadixifiv.weebly.com/uploads/1/3/4/8/134888816/102442fcc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vixoxuzet.epizy.com/pitekojomivojobe.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/ludumed.pdfIn PDF document text
    • http://roniwixanedif.epizy.com/26804882841.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/finding_the_sum_of_interior_angles_worksheet.pdfIn PDF document text
    • http://siwupogogu.rf.gd/trane_xr90_flame_sensor.pdfIn PDF document text
    • http://lelekon.epizy.com/hazmat_placards_guide.pdfIn PDF document text
    • http://podixevobelataw.rf.gd/afl_fixture_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/la_campanella_sheet_music_violin.pdfIn PDF document text
    • http://pexuxiwug.rf.gd/epistaxis_management.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/43780383007.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_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 5424 bytes
SHA-256: 8c122115a401216f299a259e618e1e1d6f9dfcd7b8b11db8b4fa3b4b10453a99
font_01_sfnt_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 10240 bytes
SHA-256: 93cd1007d3add361e3931c0ea69f756f20d40209f7ba27ce7ba23472c83dfadf

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