Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b185b9ffee5d71…

MALICIOUS

PDF

79.3 KB Created: 2021-01-23 12:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2421ed779e88f75c6960c1259e272827 SHA-1: 75aa2308a2309aef63ee672c0716285dd64fbd97 SHA-256: b4b185b9ffee5d71bb6046bfe7aa18cd4ef8dc08587e2cee286c79e8c069e6c7
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, and contains numerous embedded URLs pointing to disposable domains. The document body, though heavily obfuscated, suggests a lure related to 'blood pressure management' which is likely a pretext to drive users to these malicious sites. The presence of external URIs and the link farm heuristic indicate a phishing or redirection attempt.

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://bologen.ru/aws?utm_term=aha+guidelines+for+blood+pressure+management PDF link annotation
    • https://cdn.sqhk.co/rapowipijes/Viagfhg/zujeriwidabonelovepov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379968/normal_5fcdeff7ef244.pdfIn PDF document text
    • https://cdn.sqhk.co/wetiniwem/RhhjfVw/the_real_housewives_of_new_york_city_cast.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388158/normal_5fc593be8b75e.pdfIn PDF document text
    • https://site-1177098.mozfiles.com/files/1177098/nimenen.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/hcifhgW/safurevusisutote.pdfIn PDF document text
    • https://site-1250755.mozfiles.com/files/1250755/diablo_3_season_17_barb_leveling_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/muruwake/dgggckW/20851665541.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/cQT6idl/dwell_synonym_verb.pdfIn PDF document text
    • https://cdn.sqhk.co/zetobazox/Zdhf5cB/19487689437.pdfIn PDF document text
    • https://site-1174534.mozfiles.com/files/1174534/anime_pose_3d_apk_free.pdfIn PDF document text
    • https://site-1177296.mozfiles.com/files/1177296/warship_5e_cost.pdfIn PDF document text
    • https://site-1172574.mozfiles.com/files/1172574/fallout_shelter_special_stats.pdfIn PDF document text
    • https://site-1178690.mozfiles.com/files/1178690/nirizogatukexiw.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/Eih5ifP/ultimate_photo_blender_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jasekazus/idichdv/jexuzuferanirubukepov.pdfIn PDF document text
    • https://site-1174733.mozfiles.com/files/1174733/61942832764.pdfIn PDF document text
    • https://site-1177263.mozfiles.com/files/1177263/ignou_ba_admit_card_june_2019.pdfIn PDF document text
    • https://site-1211564.mozfiles.com/files/1211564/national_geographic_magazine_value_1970.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
    • 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_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 5468 bytes
SHA-256: e4ce0d307116dc0978fa4ef5726eb7c7d2b5d85cf299c942f9e2a42a1dcca2fa
font_01_sfnt_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 9888 bytes
SHA-256: 70cf6571cf5bbb36e2983a69919bd4e257c2e6cf840a8de081243a7c1c938bce
font_02_sfnt_off00012141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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