Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b7a8d5d723bd23…

MALICIOUS

PDF

78.1 KB Created: 2021-02-24 03:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2f15961c41ab93d6d641bed24c412c1d SHA-1: 3fc91575dadbea81f94f27984cdaddc8dbe71bb4 SHA-256: b7b7a8d5d723bd23de73dbcfc6aff0e70a0e26b3cf40da99a519dcc782e7b1a3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata related to 'logical reasoning definition' and the wkhtmltopdf tool, likely serving as a lure.

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 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.
  • 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://jottigo.ru/aws?utm_term=what+is+logical+reasoning+definition PDF link annotation
    • https://cdn.sqhk.co/wovupeni/zrjD9gh/steam_link_controller_overlay.pdfIn PDF document text
    • https://patobusogeziwe.weebly.com/uploads/1/3/4/0/134096506/kilibekasojeg.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/hifWIif/vlc_for_android_tv_apkmirror.pdfIn PDF document text
    • https://cdn.sqhk.co/gepibilis/XDkgnii/nibavizapikurob.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/gyjcjba/how_to_make_pumpkin_seeds_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/wenudiwome/djdaw8x/prop_hunt_map_code_stray_kite.pdfIn PDF document text
    • https://cdn.sqhk.co/numorolele/gsjeqx6/britney_spears_american_dream_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vigefifobot/XID7fsJ/download_game_mmx_hill_dash_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/ifjaY8o/bazinoxapawonimanesugugew.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/iejajhi/nick_jonas_diabetes_song_lyrics.pdfIn PDF document text
    • https://sapofekotor.weebly.com/uploads/1/3/1/6/131637774/kavorodadagewa-vomop-mabategukavanak-tipurorufavonuk.pdfIn PDF document text
    • https://nabidojanafo.weebly.com/uploads/1/3/4/4/134455463/lutowe.pdfIn PDF document text
    • http://testrun.ru/36848477844bipeq.pdfIn PDF document text
    • https://fipugodegiposal.weebly.com/uploads/1/3/4/6/134687615/eb563b26eca.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/fig3idy/58037411003.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 5296 bytes
SHA-256: f9fb9f57e0ff04f89c0658054ad42c6293bec0d8974e9aadcda2a5377682a43b
font_01_sfnt_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 10220 bytes
SHA-256: e4bad9d657014b988bc3a06f2793db3dc54b6fd59020fbf0f9d72ed652fdb1a3
font_02_sfnt_off000115c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 16184 bytes
SHA-256: ef1b1cc0420cc59714a22acc605427651c308d8796cba28f5675201c7f934ebb

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