Malicious PDF — malware analysis report

Static analysis result for SHA-256 8048a1178761c2c8…

MALICIOUS

PDF

88.0 KB Created: 2021-03-23 23:02:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 611d6ccc840401699445f76fea724f9a SHA-1: 11d01779c86fbceba55baca005e91059cad3c384 SHA-256: 8048a1178761c2c89156c241e4faca80251560cd9ef5e2b442b134457e7daf06
214 Risk Score

Malware Insights

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

This PDF file exhibits malicious behavior through the presence of numerous embedded links, identified as a link farm. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one link points to known malicious redirector infrastructure, specifically 'https://crophysi.ru/strik?utm_term=jerry+garcia+band+chords'. The 'PDF_SEO_LINK_FARM' heuristic further confirms the presence of a large number of external PDF links, with 'https://cdn.sqhk.co/pozigafo/enjgQoe/n64_emulator_super_n64_games_apk.pdf' being one example. The ML classifier and ClamAV detection strongly support its malicious classification. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=jerry+garcia+band+chords In PDF document text
    • https://cdn.sqhk.co/pozigafo/enjgQoe/n64_emulator_super_n64_games_apk.pdfIn PDF document text
    • https://jesidovelagira.weebly.com/uploads/1/3/4/7/134705211/63d792567.pdfIn PDF document text
    • https://cdn.sqhk.co/podoxato/iahh1ge/ryan_s_world_toys_age_group.pdfIn PDF document text
    • https://cdn.sqhk.co/jorevagu/haibaEH/jugotusuxatajabolijezod.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/wjatFic/mbta_commuter_rail_live_map.pdfIn PDF document text
    • https://cdn.sqhk.co/bijozugetav/ggLnTS0/color_gradient_iphone_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/PjdhgM8/5435697250.pdfIn PDF document text
    • https://piledefek.weebly.com/uploads/1/3/5/9/135966078/feb5ca39c214.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/eheaKhj/fractions_decimals_and_percentages_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/soxobiwefili/lhh4d21/yellow_pages_business_sign_up.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/ohcfzgc/pirelupefalupijeforepexag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_90ff787e583940bba281ce5777ed7e62.pdf?index=trueIn PDF document text
    • https://48e5b1ff-25fb-49a4-826b-3ad3f3a15688.filesusr.com/ugd/0d632a_701e7b5faa3149f4859171a721b1eacc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sukedil/audit_report_format_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/vomininudozuxekes.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/19981079526.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/nurozerilumipe.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/niledadegup.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_4ece21aa0b24497fac0d56f184e6428c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/chronicles_of_narnia_characters_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/where_to_buy_starbucks_cold_cups_bulk.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/bean_1997_movie_300mb.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/bul_bul_kannada_film_songs_free.pdfIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_dee24c8ba6aa4c22a736e9fc3e34eddd.pdf?index=trueIn 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_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 5400 bytes
SHA-256: 5336b6f6a2c159d118e204c7a15b46823e2aa102a967aa882fa6220fd51b261a
font_01_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 11844 bytes
SHA-256: 07a3fca376f641098b8d3d2cedd5022b173963c3e8f93b7f8976e02dc4bb5e62
font_02_sfnt_off00013d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D50 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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