Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc53034a3d3f8582…

MALICIOUS

PDF

116.6 KB Created: 2021-04-20 09:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 320021e0f270b5b1cea6474d4c3dec71 SHA-1: 1c8652e665266bdc81c06ec025289ba089145e58 SHA-256: dc53034a3d3f85829657fa96b9f546264400015fdc98c768187404ec956a7112
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • 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://midufefew.ru/strik?utm_term=samsung+un40h5003af+power+cord PDF link annotation
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/4347572.pdfIn PDF document text
    • http://twenty-promo2020.ru/seninirugutuzonzdyc.pdfIn PDF document text
    • https://vefarekosisag.weebly.com/uploads/1/3/4/7/134722728/jegibad.pdfIn PDF document text
    • https://dikasawo.weebly.com/uploads/1/3/5/3/135349802/venazumezup-bupizotipaxar.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/gfib113/car_crash_test_simulator_3d.pdfIn PDF document text
    • http://istlan.space/panaburixan9yvc.pdfIn PDF document text
    • http://volosaty100.xyz/xokopij1h3su.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416322/normal_6003bcd04ba28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465704/normal_6067315a3da33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422377/normal_601fe73cbe286.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/SjfVQXW/drive_in_theater_los_angeles_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476453/normal_5fec5c84581e8.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/jfic1ii/39058683965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452193/normal_600da32a1c463.pdfIn PDF document text
    • http://buylettersonline.com/mifuvubukabidonujilanijagljqu.pdfIn PDF document text
    • http://remont-pc.website/when_you_love_day6_lyricss9b4y.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwapusumoge/fNdcwjd/pakogekibubuletaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_5fd940cac2063.pdfIn PDF document text
    • https://cdn.sqhk.co/fonixoligem/liihggh/scuba_diving_simulator_underwater_shark_hunting_mod_apk.pdfIn PDF document text
    • https://wutuzorul.weebly.com/uploads/1/3/5/9/135963099/47575e59242a6.pdfIn PDF document text
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/7704395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490252/normal_60183f3e964fc.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_48d654c568524b91820ab2649770f900.pdf?index=trueIn PDF document text
    • https://a5c93f4c-8567-4308-be4d-c56d356f510a.filesusr.com/ugd/bb3bf9_dd462b3ee60b4c14b13853ba55bf5af4.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001637c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1637C 1876 bytes
SHA-256: f4b3536198ef883416aa84900d14090a531805b75b0edb02d4d4a0da32550ea4
font_01_sfnt_off00016c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C6D 6248 bytes
SHA-256: 73ab2dea230901147c36d829432f167eaa890f75d6ddb348880e8591469e6543
font_02_sfnt_off0001819a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1819A 13204 bytes
SHA-256: b1eee361e63c8147f7a3b85e1a372aaac830bb71ddfb73fbe874163df95a462a
font_03_sfnt_off0001adf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADF8 16448 bytes
SHA-256: fc2376519726d5f2fa369b00929436564a27c3696274e9153defc88ab302e4df