Malicious PDF — malware analysis report

Static analysis result for SHA-256 3316d13f28997cee…

MALICIOUS

PDF

70.3 KB Created: 2021-03-09 12:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e0fa2d03ae90a906f97af2e46437e259 SHA-1: f3c3614d07e77968b581ce935c776d64fad308e4 SHA-256: 3316d13f28997cee6143095e2250479a782c7142dc9f2e24c007d81d5424c942
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 pointing to disposable domains, indicating a link farm or SEO spamming operation. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The embedded URL `https://midufefew.ru/wb?keyword=dirt%20devil%20easy%20lite%20vacuum%20filters` is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://midufefew.ru/wb?keyword=dirt%20devil%20easy%20lite%20vacuum%20filters PDF link annotation
    • https://lekifusa.weebly.com/uploads/1/3/1/3/131382118/jusewu-nuporabese-joweviziwu.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/chaconne_bach_piano.pdfIn PDF document text
    • https://mepapezivodeno.weebly.com/uploads/1/3/0/9/130969154/a3dd5a114df307.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/how_do_i_start_a_chick-fil-a_franchise.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/67579734086.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/16370958073.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/95370477143.pdfIn PDF document text
    • http://boguzimaro.getenjoyment.net/breve_historia_del_africa_subsahariana.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/67940947122.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e34cdd3-7c94-40a5-b672-18d520ea9e75/is_coffee_free_at_dunkin_donuts_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e598b48-9a52-44e3-9556-804117df62a8/fisher_scientific_isotemp_refrigerated_circulator_910.pdfIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_377423363d7541dc88d5ea879e662c26.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d634ce-c839-4898-9423-4c1b81fcabd4/how_much_does_it_cost_to_get_a_cuckoo_clock_repair.pdfIn PDF document text
    • http://resilasijajatil.myartsonline.com/samsung_bd-h6500_manual.pdfIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_c99f91c037364106aa05108873b41b91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2ee650-095e-42cb-b96b-e1d47d65cbaa/smc_flex_bulletin_150_quick_start.pdfIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_406cff37234f4a86ac10b8856a20cfdb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3861925c-cbf2-45ef-b94f-c5fa714f32e6/vacante_de_gerente_de_alimentos_y_bebidas_en_puebla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5588c7b5-2565-40e9-a7cf-0b91f3794f8a/maytag_bravos_quiet_series_300_washer_manual.pdfIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_e06912fc44fd4875b1980a0af1b52f72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b175a7-d9ac-4142-ba69-a827c1583514/xodojamovuniwimelutevuful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60dfbf23-67b5-4145-ad6f-ca35b02fcd00/is_lexus_gx_460_expensive_to_maintain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6559c260-1cb5-4370-b1d2-af67cdcbca95/67837207898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0670536d-39b3-4e2a-bf75-44d049954f1f/17874735222.pdfIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_91322933153248909a87690a00550000.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44F 5328 bytes
SHA-256: 38cf839c8251de06777a375b18a9084a996f1f5e272e87605509565225d87aac
font_01_sfnt_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 10436 bytes
SHA-256: 49d4fadb4d90da2b3d0cbb11de2e3741a6a05e25e1175d660feeae5ac0284d02