Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8f6a45f913089d…

MALICIOUS

PDF

82.1 KB Created: 2021-03-19 03:01:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bebe37b3735771f3412ef9b9fcdf3b2 SHA-1: 502f1adfee5870279f0cf6f58cfd691a47502005 SHA-256: 6a8f6a45f913089df70742f30e82b52b4e7602380829d4ebc5d7a76cf709d558
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. The PDF contains a large number of external links, suggesting a link farm or redirection mechanism to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to direct users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/aws?utm_term=how+to+be+a+housewife+in+the+1950s
    • http://thechambre.xyz/what_is_the_jungian_shadowk5l26.pdf
    • http://antonioita.fun/podanesumuvagitatitewusm98bs.pdf
    • https://vezijukifi.weebly.com/uploads/1/3/3/9/133997169/9534528.pdf
    • https://meligobuv.weebly.com/uploads/1/3/1/0/131070858/d082bcb60.pdf
    • https://sobasoje.weebly.com/uploads/1/3/2/6/132695832/7d951b1226.pdf
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/wumamaxove_gewujifuni_bosomuluno.pdf
    • https://fafotarume.weebly.com/uploads/1/3/1/0/131069904/b1e1914.pdf
    • https://purotuduveb.weebly.com/uploads/1/3/0/7/130738796/vekujigoxume.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/muvemasoxaji/free_fact_sheet_design_template.pdf
    • https://s3.amazonaws.com/sorapobuk/20751583083.pdf
    • https://s3.amazonaws.com/jazuravazaguz/xaxofosejaneburavudu.pdf
    • https://s3.amazonaws.com/woxewiwupir/51624456137.pdf
    • https://s3.amazonaws.com/somamere/how_to_day_trade_warrior_trading_book.pdf
    • https://s3.amazonaws.com/jazuravazaguz/vyvanse_dosage_forms.pdf
    • http://vavegigodal.epizy.com/rekafulavikirafiwel.pdf
    • http://gojudupawoziwex.epizy.com/8658005442.pdf
    • https://s3.amazonaws.com/lebejos/dorajagafufujagose.pdf
    • https://s3.amazonaws.com/fatikonavori/63818552944.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4bd.bin
97177140c9578f19eea6467190646a42b5e1c67fb095afbf1d10074e18c76f97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 5276 bytes
font_01_sfnt_off000106be.bin
0cd7227d0e3b925ef70f8988d372715b1805e81b3e42aef057f176cf284e681e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 10756 bytes
font_02_sfnt_off00012b42.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B42 4324 bytes

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