Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c83218b1b630cd…

MALICIOUS

PDF

71.1 KB Created: 2021-04-19 19:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1df68df60cc4502a7b04738ab6fba7c SHA-1: 745df49aa86ce0adefac666474be60ec12ab97be SHA-256: 78c83218b1b630cd6f5e475ca65236e6c1aefb71c139dc0da5a280e7071b1037
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly benign PDF files, but one primary URL, 'https://dafemum.ru/strik?utm_term=grammaire+essentiel+du+fran%25C3%25A7ais+b2+pdf', is flagged as unknown and is likely malicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=grammaire+essentiel+du+fran%25C3%25A7ais+b2+pdf
    • https://galekogikelubem.weebly.com/uploads/1/3/1/4/131438025/wamek.pdf
    • https://jenevokitajawol.weebly.com/uploads/1/3/4/2/134235402/jabaja_xesisezuvak_fefati.pdf
    • https://xutomanuvafara.weebly.com/uploads/1/3/4/3/134345830/lokakawezonux.pdf
    • https://rilopogikumifo.weebly.com/uploads/1/3/4/3/134320310/2134e9.pdf
    • https://dovowufola.weebly.com/uploads/1/3/4/4/134438787/laxapitubanifa.pdf
    • https://sufimademum.weebly.com/uploads/1/3/4/2/134236216/447372.pdf
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/49dde71bb4.pdf
    • http://sunepoxuvigos.66ghz.com/49780250880.pdf
    • https://rawogozanukej.weebly.com/uploads/1/3/4/6/134623914/425a492500cc.pdf
    • http://mosuzovopij.22web.org/kazefomugemosajokopag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bibejovixapis/xotexilelavutipitijuma.pdf
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_58fb29338209401bbc83a0091f6143ff.pdf?index=true
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_a10f56d90e6e432982014076d8d90c11.pdf?index=true
    • https://s3.amazonaws.com/loranoduzuja/6976271287.pdf
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_3514ac83396a4fda816381e2f4ea4d58.pdf?index=true
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_7b83ce0e677747498249b00803bdc5a1.pdf?index=true
    • https://s3.amazonaws.com/jebokizez/note_20_ultra_release_date.pdf
    • http://xawugosoxule.rf.gd/new_opportunities_beginner_student_s_book.pdf
    • http://gasigigi.rf.gd/gijonojipaxapufufu.pdf
    • https://s3.amazonaws.com/xofalepelala/44580151655.pdf
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_5f242ca7f9ce4ebf89b2954de36f1a9d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf6f.bin
6141cac521a7513d1e755d783661a554161a10df7311b5a00312410249c8f842		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 5672 bytes
font_01_sfnt_off0000e29b.bin
7cc89259774c4b8591351924b2bf5f01da2d8f038db5c826b7add9220dd45ea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 13512 bytes

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