Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2505ec5546ec22…

MALICIOUS

PDF

76.1 KB Created: 2021-03-04 12:09:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 697d1111b89d5f5244c9739ff1e3e253 SHA-1: 817842cfb4dec3feda7a12ca1c4548375aca1f61 SHA-256: cd2505ec5546ec228a23ce7a49ceee8d21adc768257dcae0b7eadc40b56e8760
182 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, and employs an advance-fee scam lure related to magazine subscriptions. The document body, though heavily obfuscated, contains keywords related to subscriptions and deals, reinforcing the scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/123?utm_term=new+yorker+magazine+subscription+best+deal
    • https://bosuditibopo.weebly.com/uploads/1/3/2/7/132740628/musexus_nugekixujomoneb_rekiti.pdf
    • https://kosukanawator.weebly.com/uploads/1/3/5/3/135304621/132057.pdf
    • https://cdn-cms.f-static.net/uploads/4445343/normal_60223f152fe65.pdf
    • https://static.s123-cdn-static.com/uploads/4453344/normal_60047a301b523.pdf
    • https://static.s123-cdn-static.com/uploads/4474987/normal_5fe2eac9deedc.pdf
    • http://getdouche.xyz/bepotokozokovinipaxesegfltw9.pdf
    • http://romeita.space/83641911333we41e.pdf
    • https://cdn-cms.f-static.net/uploads/4462974/normal_60253c87b9c5c.pdf
    • https://mivatuvogap.weebly.com/uploads/1/3/4/0/134040868/13247.pdf
    • https://busozovamifolak.weebly.com/uploads/1/3/4/2/134235369/dudabij_ketefibe_firozupu.pdf
    • http://biomaniix.website/cnco_members_names_and_picturesnf2c5.pdf
    • http://sqrab.top/how_to_delete_history_in_chrome_on_androidbnis8.pdf
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/ce969d40.pdf
    • http://mojadejazisapa.sportsontheweb.net/4460718586.pdf
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/bef96b55.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kuboki/muvokunijukotu.pdf
    • https://s3.amazonaws.com/zomuzigo/bollywood_acapella_song.pdf
    • https://s3.amazonaws.com/tenunud/7970485228.pdf
    • https://s3.amazonaws.com/fuwuzerijofa/romberg_test_for_balance.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e888.bin
ea3c9dca59335e124cf1af191f15738a8c87be5880a3748c8c32a5b0b2da7335		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 5812 bytes
font_01_sfnt_off0000fc60.bin
a985ea4ce671c04712dc347e1ca6822f5bb3273181d1874acf62ecc296c9c7ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 11380 bytes

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