Malicious PDF — malware analysis report

Static analysis result for SHA-256 a870458ac229f90d…

MALICIOUS

PDF

97.3 KB Created: 2021-03-16 00:30:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6ecc3ee4e2f06976a518bfce808cb255 SHA-1: 9b145090207084c4c32ef47a96755c367db0169b SHA-256: a870458ac229f90d832d71b0eada5eb80a67a1d26010998af84f48c27c8a8eea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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.
  • 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://crophysi.ru/123?utm_term=tax+allowances+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405437/normal_6035227be6f83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_6011de8d1f9ff.pdfIn PDF document text
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/5690114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365620/normal_600795c29179f.pdfIn PDF document text
    • http://favosiwuvaru.iblogger.org/zepajivuxutapenubidafedik.pdfIn PDF document text
    • https://foxakiletomuxo.weebly.com/uploads/1/3/4/0/134012751/2663940.pdfIn PDF document text
    • https://kobuwejen.weebly.com/uploads/1/3/0/8/130873730/fovaru.pdfIn PDF document text
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/2297254.pdfIn PDF document text
    • http://zugasanuko.getenjoyment.net/18448964189.pdfIn PDF document text
    • https://jipafedi.weebly.com/uploads/1/3/0/8/130813136/7269014.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413373/normal_5ff1496b186b2.pdfIn PDF document text
    • http://devivitonewe.sportsontheweb.net/fusionner_plusieurs_adobe_reader.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_604dbc255c015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gigitepusiligo.epizy.com/32355311794.pdfIn PDF document text
    • http://sonasekofuxix.rf.gd/41984099692.pdfIn PDF document text
    • http://wizigipixe.atwebpages.com/11107480998.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/simple_star_wars_book_list.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/sazuruliroxezupude.pdfIn PDF document text
    • http://nazowovemozugiv.myartsonline.com/bdm_test.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/english_to_tagalog_translator_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/cheluvina_chakori_song_free.pdfIn PDF document text
    • http://nukamepewavux.epizy.com/income_support_reporting_a_change.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/89450499501.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/nizatadiraki.pdfIn PDF document text
    • http://vanofasara.epizy.com/fisojedazakoz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13250 4800 bytes
SHA-256: 2989a6e939cdc873492b82b60996b991b5b5ce0aa5527d422fb0062e1f8b3e16
font_01_sfnt_off000142a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A6 11568 bytes
SHA-256: a18a0b88970f919b5318c5bd64f7fb6e3578d88d416a1e2e90d3b5e9d6955dea
font_02_sfnt_off000169e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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