Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a56ed2d6f466fc…

MALICIOUS

PDF

83.6 KB Created: 2021-04-03 07:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3747e50c3edd76414f30597c05ae4b9d SHA-1: d5426a64f437e6db771b35f79d8b282bd8e219b6 SHA-256: 58a56ed2d6f466fc14d2910235e5fa05f57cedf3b5e74162b3d91eb64da07593
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting an attempt to distribute malicious content or phish for credentials. The document body, though heavily obfuscated, appears to be a lure related to software tutorials, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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=adobe+premiere+pro+cs6+full+tutorial+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403127/normal_601a67d4c9dba.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/igb5jdd/fitbit_charge_2_waterproof_or_water_resistant.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/hldbc51/simanoxavuzupuxolimev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422134/normal_6008a35561e8f.pdfIn PDF document text
    • http://tuxiwos.iblogger.org/gaguxikijezoxaniwitut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450355/normal_5ff1054b5bd85.pdfIn PDF document text
    • http://bovavep.iblogger.org/good_canon_camera_for_wildlife_photography.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392857/normal_5fdc19e90d37d.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/J9wUMgj/wallpaper_black_shark_hd_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414514/normal_5fdd8f24abc33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422620/normal_6046524a3a9e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452389/normal_6027992347877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466657/normal_60072ac38a3fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_6035c0eb3e433.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368238/normal_5ff13db433c2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416151/normal_5fe7a841286f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471692/normal_6058ee13df4a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_603af7e8aa4c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377935/normal_5fec280dd2f51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484154/normal_5ff974c3e23ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403689/normal_6005e7a14bd93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426696/normal_5fdafdf90ad23.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesubilav.epizy.com/vipodetanof.pdfIn PDF document text
    • http://guxudapese.epizy.com/is_cloud_9_movie_on_netflix.pdfIn PDF document text
    • http://mufomasugom.epizy.com/appointing_a_guardian_template.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
    • 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_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 5584 bytes
SHA-256: e393a8f61754bdb0be179903aa8bfc62f94f7015669fd39334a8cb0040d94fdb
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 11600 bytes
SHA-256: 1ca4127f0521ee60fe2a35d9cfde1d92eb50702c24cb56ff4ed49f4c42696599
font_02_sfnt_off00012b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B94 16104 bytes
SHA-256: e01b5ded4d3a1dd377799f18dee16aba5ba3cfe41915a866d8d922779bc4fe53