Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13d555b6913c7cf…

MALICIOUS

PDF

90.9 KB Created: 2021-03-27 11:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 37eb8bd1d96f81c23136cd46effa7d7c SHA-1: d3fed175893a45e1254bcb8c10c062ccfbd52418 SHA-256: c13d555b6913c7cf8affd620ea4dab9f8c975ce23450987a074cbc821b3f8b60
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of disposable hosting and a large number of links, reinforcing the phishing pretext. While no scripts were explicitly extracted, the presence of external URIs and the link farm behavior strongly suggest the document's purpose is to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=dusk+elf+pathfinder PDF link annotation
    • http://glawerry.online/does_khan_academy_have_ged_prep6pqhw.pdfIn PDF document text
    • https://popetufuwude.weebly.com/uploads/1/3/1/4/131483025/vidafodawavon-kakaxotejid.pdfIn PDF document text
    • http://storergoods.site/5891412719qwzwz.pdfIn PDF document text
    • http://ijmalan.xyz/20064283281y7c46.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/jaxusejiwagum.pdfIn PDF document text
    • http://hallhq.xyz/batman_arkham_origins_apk_data_modw0ppk.pdfIn PDF document text
    • http://meetchambre.xyz/hansons_marathon_method_plan6igmg.pdfIn PDF document text
    • http://tuzupibu.scienceontheweb.net/combination_syndrome.pdfIn PDF document text
    • http://riwalimuj.scienceontheweb.net/97307274266.pdfIn PDF document text
    • http://losqutoq.online/euro_truck_simulator_2_otobscr382.pdfIn PDF document text
    • https://muragifenujokuf.weebly.com/uploads/1/3/1/1/131164382/nonofug_mokudutodibos_sebabomukuvimu.pdfIn PDF document text
    • http://everydayy.fun/why_does_my_panasonic_cordless_phone_say_line_in_use0soe3.pdfIn PDF document text
    • http://okrasote.info/the_martian_full_movie_download_in_hindi_hdadpqv.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/bender_gestalt_test.pdfIn PDF document text
    • http://goloszauniver.fun/tuforukimolenobuvl3.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/the_conference_of_the_birds_book_5.pdfIn PDF document text
    • https://fezuwujazu.weebly.com/uploads/1/3/5/3/135347069/6895417.pdfIn PDF document text
    • http://titanovyi-filtr.ru/kruger_national_park_1_day_guided_toursoonvs.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://s3.amazonaws.com/dazinibonofobi/how_to_make_an_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/t_maxx_2.5_engine_rebuild.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/vagonojexoninolowom.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001195e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195E 4964 bytes
SHA-256: 2756dda686b1978ee7f29cc68e735ed554657f3ec3b1a94d86bc05ce3f622794
font_01_sfnt_off00012a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2E 11240 bytes
SHA-256: e5ee32a0556b79dca00b92f8a112c8708e5dbb218f10e08b47843b84f0d453fb
font_02_sfnt_off00015080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15080 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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