Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57b2e4b972a1ead…

MALICIOUS

PDF

83.7 KB Created: 2021-05-16 06:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: faa68008694a4b37cdf5b8833ee7ec7d SHA-1: 2e1cb89a62139595ccdbd6ecd90e2cb1a25094cf SHA-256: b57b2e4b972a1ead3543842b1fca7ac1ef9ed27c4c61ebe85e357a5f23f8cb96
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially malicious hosting. The document body, though heavily obfuscated, contains a title related to antibodies, suggesting a lure to trick users into clicking the malicious links.

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://resalured.ru/strik?utm_term=que+significa+no+tener+anticuerpos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470679/normal_600d27bb62f97.pdfIn PDF document text
    • http://vukosam.22web.org/famamalosamewememet.pdfIn PDF document text
    • http://opensoda.pro/what_poem_is_recited_in_a_river_runs_through_it7xr3h.pdfIn PDF document text
    • http://jofigapowewumaw.22web.org/jodasiwatigo.pdfIn PDF document text
    • http://top-odejda.com/86177904487mr5uj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456165/normal_603a288ad1bc3.pdfIn PDF document text
    • http://gogotmif.space/how_to_set_the_time_on_sony_icf-c1thyfah.pdfIn PDF document text
    • http://tiktokfrance.fun/2862588080oyyse.pdfIn PDF document text
    • http://roflan.site/appointive_director_data_sheetg0sto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499341/normal_603c1de2a214c.pdfIn PDF document text
    • http://elinekici.online/kotaderojalodagijeludgw4gf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_6052eccb5735b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426423/normal_5ffb896273b1b.pdfIn PDF document text
    • http://recepty-dd.info/vejaze0dcj4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409256/normal_5fe8d6a828e46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jawozamamopenis.rf.gd/awdhesh_premi_video_mp4_hd.pdfIn PDF document text
    • http://ranokevizo.rf.gd/blue_eyes_dj_song_mobilekida.pdfIn PDF document text
    • http://sasuwirakib.rf.gd/bhagavad_gita_chapter_18_chinmaya_mission.pdfIn PDF document text
    • http://dirodinuvuz.rf.gd/vehicle_trade_appraisal_form.pdfIn PDF document text
    • http://vilobeve.rf.gd/achilles_tendinopathy_exercises.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 5212 bytes
SHA-256: d7cf996c233d3eaedbac828ffcb5e9a8d1d043ce6c1b542c36474c27ad365cd5
font_01_sfnt_off000118c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C2 12232 bytes
SHA-256: 4bc3f839baf8efc521b4fb5a80a447cd11b17461540f54bee59f9d10c3966dc5

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