Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ae66cec1995607…

MALICIOUS

PDF

81.0 KB Created: 2021-03-18 00:31:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7e708e37c9e6f98d540bbb1ebd80b59c SHA-1: 5af9297b89bce47471f11745fcbbe0c1c08753f4 SHA-256: 28ae66cec1995607a00cbe7f799b01e2e100d821ad5a92a4e8aa40a75160d5e5
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with multiple external URIs pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL and the heuristic for a disposable link farm indicate an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://baarspo.ru/123?utm_term=athletic+injury+report+form+template PDF link annotation
    • http://rawenspant.online/faxepitawiwoseblgad8.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/tifaibb/biennial_report_epa.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/juzobawepodogivemometuxi.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/8683629648.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/zomidoduravebadoroxoxax.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirijobadi/hhhHggi/jedekirimazajit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486351/normal_5fdefa2a99258.pdfIn PDF document text
    • http://gatofupimekow.mywebcommunity.org/dometic_brisk_air_2_heat_strip_installation.pdfIn PDF document text
    • http://hdvideo.design/tukotezoxukeniyyx8p.pdfIn PDF document text
    • http://characduwe.space/2001_honda_rancher_350_4x4_top_speed79nnk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5fd2e40538323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490266/normal_5fdc06bde4787.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/how_to_connect_hp_printer_to_wireless_network_on_mac.pdfIn PDF document text
    • http://jovepodixowofow.mygamesonline.org/pdf_bearbeitungs_app_android.pdfIn PDF document text
    • https://cdn.sqhk.co/lukapokobejo/L2jejdp/gipolalozegidafibivumuve.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/cdjhjaD/80463947772.pdfIn PDF document text
    • http://tonevagewalilu.medianewsonline.com/oracle_sql_interview_questions_download.pdfIn PDF document text
    • https://cdn.sqhk.co/duwutawuna/fkcTifL/gipezuwiwibasemedaw.pdfIn PDF document text
    • http://migriruy.ru/actor_who_played_baby_grinchmclkn.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://sojufuka.atwebpages.com/sarah_dessen_the_truth_about_forever_age_rating.pdfIn PDF document text
    • http://zorijefugixor.atwebpages.com/vugexomovanedawi.pdfIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_dac3635a7c344633ac1bb984bfb942e4.pdf?index=trueIn PDF document text
    • https://40c507a3-37b7-491f-afd3-f28ba3af1fb2.filesusr.com/ugd/7f5264_d0078ed24c08433283ae90ff623e9b14.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_516040013cd940bdad329f248cc5e48d.pdf?index=trueIn PDF document text
    • http://ritumogadoj.onlinewebshop.net/how_to_use_prestige_induction_stove_pic_2.0_v2.pdfIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_11eb5980dd4541a6a1ef9213b31d3a4f.pdf?index=trueIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_15a3ba7581be4dad82f7ebb54f7fcab8.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_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 5124 bytes
SHA-256: bfc4cc877b49a242f70c0112f9e83bcaf873089d1cc90f6ded0c4e9fa849f22a
font_01_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 10624 bytes
SHA-256: 6209065b5b942015eb5b3e564ec350c4366fbdfb5b5a7635d6a51d01084416b3
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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