Malicious PDF — malware analysis report

Static analysis result for SHA-256 c979c3236819506d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-24 00:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bb1af9e9bb01c733c51fd304bf29b9be SHA-1: 51c6887c0df673e69179580cf6f163e10b2c9df3 SHA-256: c979c3236819506d063ecc7c87a32651faf97e86a4b903de24566bb46b00d734
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high number of external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a second-stage payload via the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=zapya+download+old+version PDF link annotation
    • http://i-physiology.ru/upload/kuvome.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/51316386611.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/36015719256.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/tnr1f3rosocb9ef5u4l8kllt8d/99275180560.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210904160716.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/46716565164.pdfIn PDF document text
    • http://hflchw.com/upload/file/91355536856.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/kilaxeba.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/63854437514.pdfIn PDF document text
    • http://nktrading.qa/file/files/63017442732.pdfIn PDF document text
    • http://stattus.com/assets/file/kabijeditoxibon.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/keduzujitajofajunaw.pdfIn PDF document text
    • http://dongphat.net/upload/files/25660966289.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/mirolidewanupudixifuxofa.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/29731098295.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/xojatodijowasujuzamu.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/bikufidadines.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/64076281339.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/2879558916.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/sikujitazage.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/75586034903.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/82be8ee9d9fead561e44f5f32459cee6/tinomukekakebemojewemazub.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/warasadebosiwilepapoka.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/fevepefemiwepolumufeva.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/widoderofuvarakiwadaw.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/zaganatiwozuvevir.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 17436 bytes
SHA-256: bc0a01dd3034b76501b1df51c82388176d2e728483cf7b9503b4ced2768df54e
font_01_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12186 10516 bytes
SHA-256: aeb9f02de3a2b4da80a7ab823fed354c84d319ddb8e6e776c8d9936ddc30ef63