Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d8f7aa347ff8f2…

MALICIOUS

PDF

85.1 KB Created: 2021-01-24 06:07:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1f70fd8362edaca30d25dcecf74b8c65 SHA-1: d3ad28ef4c01c1181b3f9e1a0986cf858358a906 SHA-256: 22d8f7aa347ff8f2704f9c19acb347925b3364195042fea54ee64aadeefebc4b
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with a primary one pointing to 'baarspo.ru', suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains text related to '170 x 50 mirror' and 'wkhtmltopdf', which is likely a lure to disguise the malicious intent. No scripts were extracted, but the presence of numerous links and the high ML score point to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://baarspo.ru/123?utm_term=170+x+50+mirror PDF link annotation
    • https://site-1171754.mozfiles.com/files/1171754/checker_plate_sheets_size.pdfIn PDF document text
    • http://pimolala.22web.org/12395268857.pdfIn PDF document text
    • https://site-1173660.mozfiles.com/files/1173660/58776681162.pdfIn PDF document text
    • https://site-1171784.mozfiles.com/files/1171784/cherry_fruit_free_images.pdfIn PDF document text
    • http://mozuganimaf.66ghz.com/printable_mathematics_worksheets_for_grade_3.pdfIn PDF document text
    • https://xamivozafuju.weebly.com/uploads/1/3/5/3/135308546/zunapobudajopisi.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/6402209.pdfIn PDF document text
    • https://bawigadumifop.weebly.com/uploads/1/3/4/4/134494387/1469071.pdfIn PDF document text
    • https://site-1260424.mozfiles.com/files/1260424/larinimiweku.pdfIn PDF document text
    • https://site-1168324.mozfiles.com/files/1168324/317504102.pdfIn PDF document text
    • https://site-1172631.mozfiles.com/files/1172631/notes_icon_blue_aesthetic.pdfIn PDF document text
    • https://site-1171806.mozfiles.com/files/1171806/xovadedotebepabelo.pdfIn PDF document text
    • http://jotijitod.66ghz.com/11193856958.pdfIn PDF document text
    • http://safagiko.iblogger.org/pipetatusobufimogafasav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vigukesege.epizy.com/livin_on_a_prayer_drum_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/wenozim.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011e91.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11E91 23628 bytes
SHA-256: f69a22020133c6ead4183cc3ba4204ad870147ff503aa216003bc0e7eb62aa6e
font_00_sfnt_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 4784 bytes
SHA-256: 87f6ad8fdc0d1736309c9e693af68e9e0ae0bb4648874888941f1d590c69af87
font_01_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 11508 bytes
SHA-256: 1170681835f7264d3fb6a3a13607401dcf71f3fcd989a1400b21661ed6070d33

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