Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d010f0cabdd4e1f…

MALICIOUS

PDF

78.8 KB Created: 2021-03-31 13:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2ef46f7655249762d1b4387f36c6f535 SHA-1: 27ca9a4b8577d44381775b7b4db93a2f9fb6bec6 SHA-256: 2d010f0cabdd4e1f4ecc2d94ef89f9385cbb815b949f71e6b9edb9b6b66489c6
186 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 pointing to disposable domains, suggesting an SEO spam or link farm operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=business+plan+sample+pdf PDF link annotation
    • http://xobilosusi.sportsontheweb.net/electrophilic_substitution_reaction_of_pyrrole.pdfIn PDF document text
    • http://dewikul.22web.org/arabesques_debussy.pdfIn PDF document text
    • https://jelonuzekuxenu.weebly.com/uploads/1/3/2/8/132814084/feboxujokejilu.pdfIn PDF document text
    • http://wowuzarupi.iblogger.org/post_traumatic_stress_disorder_journal_articles.pdfIn PDF document text
    • https://fufarolobol.weebly.com/uploads/1/3/4/5/134597676/4417799.pdfIn PDF document text
    • https://vuveresob.weebly.com/uploads/1/3/4/5/134589217/3859444.pdfIn PDF document text
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/wonabalibivovaxepu.pdfIn PDF document text
    • https://jadipiruw.weebly.com/uploads/1/3/0/8/130814676/29d72d2077e7ae.pdfIn PDF document text
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/7715739.pdfIn PDF document text
    • https://pudavupotel.weebly.com/uploads/1/3/5/3/135335197/9803465.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zizokeb.rf.gd/the_logic_of_american_politics_9th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/wallpaper_for_android_tv.pdfIn PDF document text
    • http://favugilodufim.epizy.com/tomirab.pdfIn PDF document text
    • http://tosawivigibi.rf.gd/soda_stream_refill_gas_south_africa.pdfIn PDF document text
    • http://kemesid.onlinewebshop.net/org._apache._poi._xwpf._converter._jar_maven.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/53050397698.pdfIn PDF document text
    • http://divasopib.rf.gd/edit_blackout_text.pdfIn PDF document text
    • http://gejiferidixap.rf.gd/zazupofu.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/maquina_de_coser_singer_simple_2263_manual.pdfIn PDF document text
    • http://zepikuxan.epizy.com/didijizuzokuwav.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_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 5140 bytes
SHA-256: 8aff82ca84086b55c9cced73025685ffe0dba636f3a2eb66584aae58c7238fe8
font_01_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 10540 bytes
SHA-256: bdbb69725b94894d65e7368531de8824ae90c135b27311a9078eade5ddf041a6

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