Malicious PDF — malware analysis report

Static analysis result for SHA-256 995284cb970dd9d7…

MALICIOUS

PDF

73.1 KB Created: 2021-01-25 14:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 495dfa8fa29fdc201c0a14b3d5e70577 SHA-1: cc029f2736d85851bb82ecfa82728611c86e9b57 SHA-256: 995284cb970dd9d71ad20fdc3b45abd671ebd8e8e6111dd8e3866b80f821d1d1
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many hosted on disposable domains or link farms, strongly suggests a phishing or malware distribution attempt. The ML classifier also indicated a high probability of maliciousness. The document body, though heavily corrupted, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/123?utm_term=carta+para+mi+mismo+cuando+tenia+20+a%25C3%25B1os PDF link annotation
    • https://cdn.sqhk.co/pixisuja/dpgipnx/epic_conquest_apk_uptodown.pdfIn PDF document text
    • http://espaceabonnes.com/lajob4ncos.pdfIn PDF document text
    • https://balikawe.weebly.com/uploads/1/3/4/6/134659528/4786285.pdfIn PDF document text
    • http://stileidmo.fun/goaliath_23_over_the_door_mini_basketball_hoop7zido.pdfIn PDF document text
    • http://unlockdeals.shop/youtube_views_counter_livewt9kl.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/jtIgeif/gonedozilalafuvoso.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/hdGhggh/super_tank_rumble_mod_apk_4._0._4.pdfIn PDF document text
    • http://aycotoro5.xyz/49037068407lfxhk.pdfIn PDF document text
    • http://scandisvet.ru/appradiolive_navigation_appnit13.pdfIn PDF document text
    • http://winwites.space/cartoon_tv_series_90s1r42a.pdfIn PDF document text
    • http://mirror-x.org/psycho_bunny_bucket_hat548cs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/lajiforelot.pdfIn PDF document text
    • http://danijikuguwidak.rf.gd/alimentacin_complementaria_minsa.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 5576 bytes
SHA-256: 1e0028adce30359fd15cc1eeb04ad2c17a01c02f3b5782099cd8f6210d693905
font_01_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 11248 bytes
SHA-256: 9c9b7dd12ae5a4df181582b17fecc4b0f525ca3b8536498f8d4cf2fa0ac06fee

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