Malicious PDF — malware analysis report

Static analysis result for SHA-256 b348973426e612f6…

MALICIOUS

PDF

76.6 KB Created: 2021-03-28 16:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ff15143d8d0ecf2613f7911f54947faa SHA-1: 25dbda9eed57a772696b2a5794c7a9aab5136474 SHA-256: b348973426e612f6fd17c9a8f9f094f377914f377de8d1b477a1d3b0341fffc7
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that point to link farms hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=amplifiers+pdf+notes PDF link annotation
    • http://tryse.xyz/big_data_analytics_jntu_notes4q1bg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482407/normal_5fd0b7b097306.pdfIn PDF document text
    • http://legendbilisim.com/andor_s_trail_walkthroughpadtd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_604a21468dbcd.pdfIn PDF document text
    • http://xezimev.22web.org/operational_amplifier_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kivutuzo/gewhbj9/zufibafetesaj.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/jqjaSS8/jezotadixulobejorixuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464739/normal_5fd9e0b66c1d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422168/normal_5ffbe69d86bbd.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/jijlGjh/marvel_comic_book_app.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/nut3dwP/chirutha_songs_free_320kbps_doregama.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/muvarelo/figurative_language_ppt_8th_grade.pdfIn PDF document text
    • http://zosuwowatapaji.rf.gd/dibujos_de_caras_de_bebes_para_colorear.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/java_swing_login_form_example_netbeans.pdfIn PDF document text
    • http://xadujagi.epizy.com/where_is_philips_located.pdfIn PDF document text
    • http://wajodojizofe.epizy.com/nezunifo.pdfIn PDF document text
    • http://tevovineluf.rf.gd/ny_subway_map_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 4752 bytes
SHA-256: ff488d02fe2330fc21ba8fdc65028088bde259557637db799691c8131cd5f9f2
font_01_sfnt_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 10504 bytes
SHA-256: 8d390301364358509c0e838753b9f4eec07ab16b2d0151bb4445a9903ed0aad3
font_02_sfnt_off00011729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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