Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e198d207b4e7ef…

MALICIOUS

PDF

82.0 KB Created: 2021-03-01 07:19:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4747e3aa17d0e670ffcecf6c5124f22 SHA-1: efd9f81f7ecff9c0b5105f68f14bfabb2bf39dc9 SHA-256: 10e198d207b4e7ef24087e3b542da6a00b04c8f107d9b41009e9b0d31d9fa5ab
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely to deliver a malicious payload or phish for credentials. The document body, though heavily obfuscated, appears to be a lure related to 'Trigonometric limits worksheet with solutions'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://pelibifir.ru/award?keyword=trigonometric+limits+worksheet+with+solutions
    • https://cdn-cms.f-static.net/uploads/4449973/normal_602420161e362.pdf
    • https://cdn.sqhk.co/tomubozes/thcijsR/40664184260.pdf
    • https://cdn-cms.f-static.net/uploads/4448345/normal_603344db9e1ba.pdf
    • https://cdn.sqhk.co/xoxapivasif/Vgigjcn/stripe_pay_invoice_api.pdf
    • https://static.s123-cdn-static.com/uploads/4452846/normal_6008b3ac7898a.pdf
    • https://static.s123-cdn-static.com/uploads/4404723/normal_5feeec0a7decb.pdf
    • https://static.s123-cdn-static.com/uploads/4502245/normal_6008e103cee9d.pdf
    • https://static.s123-cdn-static.com/uploads/4412905/normal_5fed9cf885544.pdf
    • https://cdn-cms.f-static.net/uploads/4416934/normal_603128cbae325.pdf
    • https://cdn-cms.f-static.net/uploads/4472185/normal_6016fc545c689.pdf
    • https://static.s123-cdn-static.com/uploads/4500446/normal_5ff601cbf3435.pdf
    • https://cdn.sqhk.co/niwexifa/sibghk3/vusujojosuli.pdf
    • http://dimozakebaba.scienceontheweb.net/primeros_auxilios_psicolgicos_oms_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xixonu/qr_barcode_reader_app.pdf
    • https://s3.amazonaws.com/tuxexi/free_typable_family_tree_template.pdf
    • https://s3.amazonaws.com/tizowodifi/aztec_calendar_wallpapers_for_android.pdf
    • https://s3.amazonaws.com/sugosubexez/edinson_cavani_injury_report.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_off0000e3a8.bin
fdd28388b33507a056de44c627b4516f1d62d71987529cb4154f3614f9b95b89
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A8 5108 bytes
font_01_sfnt_off0000f4f8.bin
befb9161ddf3440624016bbba275751205053014d4d74f53aee1d67bd66ab8c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 15200 bytes
font_02_sfnt_off000125b6.bin
2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357
pdf-font-stream PDF embedded font (sfnt) at offset 0x125B6 16060 bytes