Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd64c5258ed215d…

MALICIOUS

PDF

126.4 KB Created: 2021-04-04 02:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dc16a89a0882c5e7cfd7e1f1feef2617 SHA-1: 6583a05e5133842fba586dff39a64e24ba21d298 SHA-256: 3dd64c5258ed215d18797f8efee568cf43b4d542996fb470d064a9be21d636be
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://vilenefex.ru/wix?keyword=the+crew+trophy+guide PDF link annotation
    • http://vivubowi.getenjoyment.net/lixalepibava.pdfIn PDF document text
    • http://sanelobazigi.medianewsonline.com/aashto_soil_classification.pdfIn PDF document text
    • http://hurleyshamburgers.com/fagut7l4jw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493553/normal_6033109606d67.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/47131400238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_605d8b273c418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467936/normal_6022bddfa0fd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420617/normal_5fcaa8365cf37.pdfIn PDF document text
    • http://carinsusa.info/the_metamorphosis_stanley_corngoldau59t.pdfIn PDF document text
    • http://russianstravel.ru/is_there_a_weight_limit_for_carry_on_bags_spiritjvztj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484641/normal_6026611be5356.pdfIn PDF document text
    • http://twoup-viktoria.online/60502898494wfyuo.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/rabivotalorizojubapo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://62bfe9e3-d01a-456c-9d14-3ac71290fd99.filesusr.com/ugd/cfe640_4f0c33c647a844a18f716db18dc48099.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/935e4a15-10c5-48b2-a8ac-27ecbe1de2b1/how_to_reset_a_dehumidifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcd11b71-a13e-458b-af99-c8f2d2cdccd9/is_mail_being_shipped_internationally.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622cbb46-7088-43c2-819f-242c20c0aa1e/pejexup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25adf11e-b104-4796-9780-484e94ce5346/zobavibovuve.pdfIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_e563e1de9aee4944af7bb69282062e95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2897b9a8-edf7-4c0c-863e-d1c0c7a20f7c/four_freedoms_speech_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e80fd5d3-2cb6-4c83-9c80-f7d7810fee77/how_to_structure_an_argumentative_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/889caa5b-48c0-40ee-a497-9d1dad92e7ff/3210705975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84b7b0b5-1385-4455-b7b9-48bef4887641/gadawuxukerutujojibumadip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b73470-1884-48e7-8274-ddab57f21a57/what_type_of_chemical_reaction_is_n2g__h2g__nh3g.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12e89356-ee4d-4160-9100-70e318bd579d/sundara_kandam_in_tamil_movie_download.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_off0001b436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B436 5060 bytes
SHA-256: 938352979b5ca7e3277e89689016ca20402bcaf706e86d12e0fc9215ef843ad7
font_01_sfnt_off0001c57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C57E 11124 bytes
SHA-256: db84e23ea9c95c30672381fd52e66ed09014007e559cd005407a606df7467fdd