Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d26789d8067e19b…

MALICIOUS

PDF

97.2 KB Created: 2021-04-01 21:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bab56ece7a1552b665028b3d99903f22 SHA-1: 26ab3110e25c3229cd28c33b5e71c9a129e284d5 SHA-256: 7d26789d8067e19b5287b658f4eb4ab39a320cdd4f0cf653c26b0550ff863b3e
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on link farms, indicative of SEO manipulation for phishing or scam purposes. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly suggests the document's content is designed to trick users into paying fees for non-existent prizes or parcels. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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.
  • 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://leonvi.ru/award?keyword=the+design+of+approximation+algorithms+pdf
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/bililakutus.pdf
    • https://xepevuke.weebly.com/uploads/1/3/0/7/130775471/2518503.pdf
    • https://dinorega.weebly.com/uploads/1/3/3/9/133999175/kalupakalibetipa.pdf
    • http://webcam-model.online/my_family_story_badgep00ao.pdf
    • http://7lessons.space/whatsapp_plus_for_android_uptodownfvgro.pdf
    • http://vash-fasad.live/577321326111cquq.pdf
    • http://bristol-yalta.run/remumebusaminukesapotok4gw6s.pdf
    • https://xovifare.weebly.com/uploads/1/3/4/5/134524114/nulepoda_mupofulax_tixazo_tulorido.pdf
    • https://xisofapetuv.weebly.com/uploads/1/3/4/7/134747578/69d6cbdbc0934.pdf
    • https://ruvavaru.weebly.com/uploads/1/3/0/8/130874457/253be64ffd58627.pdf
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/6012489.pdf
    • http://saudiautoinsurance.com/8172585290759aus.pdf
    • https://ponekuxu.weebly.com/uploads/1/3/4/7/134747949/nevodose-jetinomamowakag.pdf
    • http://modernstyle.pro/safomf04zr.pdf
    • http://good-production11.site/63365480783bgt7s.pdf
    • https://jinonapipi.weebly.com/uploads/1/3/4/4/134481743/kimamapil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_f4de5d5434b148eab389ad3a42d81ea7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6ac6be34-f383-4b78-9809-40a4e3f6c1f8/bifuregebaxowopegoxetamo.pdf
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_493e16c1494c4de49f98268e2e45d28d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b3026edf-bce2-4ab8-9538-b8efbd7feb41/78909517144.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127a5.bin
db1f04fd87314d6a17c00f4765725b609ba47efa872deffabd18ad4f2898826a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127A5 5472 bytes
font_01_sfnt_off00013a22.bin
a98326d2edfdf550658022e7e4f262f363f5e450fb0f59ed4093bd420a41438f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A22 12500 bytes
font_02_sfnt_off0001621e.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1621E 16060 bytes

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