Malicious PDF — malware analysis report

Static analysis result for SHA-256 8600119843ef1286…

MALICIOUS

PDF

92.5 KB Created: 2021-04-07 23:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3423b664b1305268276e42d5a77ea9f6 SHA-1: 2ab7f23adcad95365d45791a0eca2118189d00f5 SHA-256: 8600119843ef1286444613fc1597b33c521ebae02bd0a548a016c4ed1d4b5204
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one prominent URL pointing to a domain associated with malicious activity. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a site that serves further malicious content or attempts to phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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=two+step+equations+worksheet+grade+7 PDF link annotation
    • https://cdn.sqhk.co/kefekawit/ihd8gev/ladamejinasu.pdfIn PDF document text
    • http://cheeronthemove.store/46251541108rf3k1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464523/normal_5fd6d9b899b93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459640/normal_5ffe701c4cd5a.pdfIn PDF document text
    • https://cdn.sqhk.co/papebikuwi/hbXQ2gc/68295090080.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/ghcjj35/74800176155.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunadegu/nicgi1W/tv_series_wallpaper_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486535/normal_5fd64661f012a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_60461d1feedb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_6026e32432bc2.pdfIn PDF document text
    • http://indital.fun/gipenasetuza8dybq.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/0jbJgia/bellator_mma_vs_ufc_cual_es_mejor.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/jarAgV2/shop_woodworking_tools.pdfIn PDF document text
    • http://hidver.com/are_leonardo_dicaprio_and_claire_danes_friendshn8xo.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • http://dressnbuy.com/14420850897yhn6h.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://uploads.strikinglycdn.com/files/d63026a4-c673-4e91-934a-bd46c5c3702e/is_oreck_a_good_air_purifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57afd07c-5487-479a-a9f5-8b64ff0f9465/top_notch_fundamentals_a_third_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c01f896-d832-42bf-aaa6-4747cc75a9de/fotizozokej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a10dbba-f0eb-4ff6-8e7d-ddf29560d71b/bass_tracker_trailer_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/xixisutijodebagasibenizat.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/what_is_iso_2015_certification.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/fukiluperolagifowejetufa.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/how_to_study_macbeth.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/linanowunux.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 5384 bytes
SHA-256: 90660927da71d5efe56bd51f4858f00e6c723317c82814ed38131f2cc5e29155
font_02_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 11976 bytes
SHA-256: 557250eb0bfb4dd901d5c0b1e258afc1c1f32fc52c4af6ba789551b298b7f6ec
font_03_sfnt_off00013b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B29 16840 bytes
SHA-256: 779e30bb5dce9206a6b66e5fc6cf3a6397dfe93504ef65db2986ef058885fca9
font_04_sfnt_off000152f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176