Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9ec9a0bb8a8c9f…

MALICIOUS

PDF

92.4 KB Created: 2021-03-02 13:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 035786a62319d0d96b9f32bb97c85847 SHA-1: e26b599d443c5c14589381f54d952529c5aea5f7 SHA-256: fb9ec9a0bb8a8c9fd289f0dcc544bf317bc8438ec825962460863e474a11c2c3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to educational content, which is a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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/strik?utm_term=arabic+grammar+in+urdu%252Fhindi+-+class+02 PDF link annotation
    • http://naturaleone.space/sociological_perspective_of_religionfl7sv.pdfIn PDF document text
    • https://gupexududoteg.weebly.com/uploads/1/3/5/3/135302954/f38c74d4803d99.pdfIn PDF document text
    • https://lurevovikofa.weebly.com/uploads/1/3/4/6/134693735/113ce730b.pdfIn PDF document text
    • http://saudiautoinsurance.com/zinanuxipejofojitev3gb5o.pdfIn PDF document text
    • https://jarosebat.weebly.com/uploads/1/3/4/6/134695718/pazufumu.pdfIn PDF document text
    • http://nelawetazabuta.66ghz.com/magento_installation_guide.pdfIn PDF document text
    • http://verezitabel.66ghz.com/wigexebotovuworu.pdfIn PDF document text
    • http://cparta.moscow/stranded_deep_32_bits_2018o02a0.pdfIn PDF document text
    • https://gakosokilexavum.weebly.com/uploads/1/3/2/6/132695298/wejijerafeput.pdfIn PDF document text
    • http://shortsomfj.space/disakipujalokataramd4enw.pdfIn PDF document text
    • http://vomojagibolib.iblogger.org/games_like_nancy_drew.pdfIn PDF document text
    • http://idclick.cash/1888903626asafk.pdfIn PDF document text
    • http://gonzo-3d.com/62127409935343b3.pdfIn PDF document text
    • https://fuxexitir.weebly.com/uploads/1/3/4/0/134098624/ruwud-tixotejitu-pesabi.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://vizijikiwoler.rf.gd/30296886128.pdfIn PDF document text
    • http://menawikilu.rf.gd/7458511837.pdfIn PDF document text
    • http://mupegutiwigo.epizy.com/33775041923.pdfIn PDF document text
    • http://fozubogedunok.rf.gd/reinforced_concrete_design_examples.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000126ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x126AD 25860 bytes
SHA-256: cf2aa4c2c40a6c52f42f2bbedbcbbffb0833de26089c95ab3a3a78f7afbaa68f
font_00_sfnt_off0000e58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 3152 bytes
SHA-256: d9d06b5a712afc570ada4aff54b8dbb7926b6678cdc5ebb5aaebce2e9e7ba7e2
font_01_sfnt_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 5400 bytes
SHA-256: 101a906ec68b8b356325cb1cab77b90184a336b75281ea607a3c069a2e6430ca
font_02_sfnt_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 10828 bytes
SHA-256: f9b2599e906509eceed76c78262821392b45da62c8ed9cef3f1aaf6f8b41c0b4
font_04_sfnt_off000154f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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