Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d533d42737b0cb8…

MALICIOUS

PDF

84.7 KB Created: 2021-03-22 11:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b7a14d9fa1e3a5138e1137e4c1213746 SHA-1: 83ed460ca0e40e011ca19f0dc936938eb2049cdc SHA-256: 5d533d42737b0cb8e2be68c78d406f57525c965c0be971ddb23d919338c4ada5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://vilenefex.ru/award?keyword=online+advertising+thesis+pdf PDF link annotation
    • http://autoupgrade.website/vefaxomu40ulc.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/idbvjac/11626041736.pdfIn PDF document text
    • https://cdn.sqhk.co/padezeda/IpicFib/xikasibeb.pdfIn PDF document text
    • https://cdn.sqhk.co/guzikiku/Thiig8D/best_analogue_clock_widget_android.pdfIn PDF document text
    • https://cdn.sqhk.co/porodiwaten/chfjgfK/ebay_thrift_trader.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/noxitawokuloswqz6j.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/hOgehhK/veras.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/hgehfgc/world_robot_boxing_2_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/jgjigfi/88227093622.pdfIn PDF document text
    • http://rabizepafuxonag.mypressonline.com/automatic_watch_repair.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/81ifgdu/motimowapemudajorof.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/40287255856.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/hgmEhhd/throne_of_eldraine_brawl_decks_value.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/hbSrcgi/decisive_battle_of_napoleonic_wars.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/jfhhCjc/gurusuxegatobozofozen.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/icTU6hd/26992327813.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/7Vdggge/96810493673.pdfIn PDF document text
    • http://topcreditcheck.info/fallout_4_map_all_locations_mod_skyrimhx05c.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://paguxesij.myartsonline.com/1000_books_to_read_before_you_die_list.pdfIn PDF document text
    • https://ebd157e6-94c3-4ff5-b3ab-516f87acbde6.filesusr.com/ugd/e87473_199ac9a0870d44ef969a29cdd0b64dab.pdf?index=trueIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_50c06c5f78e543f6b1d831e3fa1eda4a.pdf?index=trueIn PDF document text
    • http://kojenixerog.myartsonline.com/google_maps_api_documentation.pdfIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_c6396cf6c29a486b94e200549e761f5f.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 5068 bytes
SHA-256: df8f82c4db8e3ca0dfcf2ffc46d9bc94544ff9aa2869ab9eb2a3c7ee06a47008
font_01_sfnt_off0001110c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 11124 bytes
SHA-256: c231bd3a2950335cd7f7447bf9694575d8094a7ab87757e34a01cc0dd8f8ec9b
font_02_sfnt_off000136fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FD 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230