Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfeda5729a3e58e…

MALICIOUS

PDF

79.1 KB Created: 2021-05-11 19:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1a634e744247f674b9ce10022cd9ca49 SHA-1: 98300eeeadbff35e287874b930917e60d6cc472b SHA-256: 4dfeda5729a3e58ed757774d8d0c1672fd5863024e3f0a70718721611b09e457
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://mezovuduw.ru/strik?utm_term=xfinity+xr2+remote+codes+for+samsung+tv PDF link annotation
    • http://kebotup.66ghz.com/d_d_divination_wizard_guide.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/garagosirusaz.pdfIn PDF document text
    • http://ributufukepun.66ghz.com/asus_sabertooth_z77_bios_update.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/secured_to_jpg.pdfIn PDF document text
    • http://bawimip.sportsontheweb.net/complicaciones_toracicas_del_absceso_hepatico_amebiano.pdfIn PDF document text
    • http://vuxilenusip.mypressonline.com/asymptotic_notation.pdfIn PDF document text
    • http://xokezuwadem.mygamesonline.org/masag.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/xeron.pdfIn PDF document text
    • http://zifufarox.getenjoyment.net/90040158622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3b86e06-b3aa-4ee1-82f7-79049f3379a8.filesusr.com/ugd/0c4fd2_04ca26e333344cf0858ef9e091058914.pdf?index=trueIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_4bbe9b3039e3400785ea13953d2e7832.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82171567-64b7-4f76-af83-e8c291d8fc99/2_line_cordless_phone_system_with_answering_machine.pdfIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_561e0a26948342399cc68386c676f988.pdf?index=trueIn PDF document text
    • http://tosijikis.onlinewebshop.net/96361248480.pdfIn PDF document text
    • http://tarusuja.epizy.com/insert_text_placeholder_word_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e2dd83f-70ae-417a-a81a-448f21e26565/what_words_have_eight_letters.pdfIn PDF document text
    • http://xupoputidug.rf.gd/automatic_process_control_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abd86d2-8ca0-4b8b-b3f9-09783a34a7eb/hp_8000_elite_power_supply_replacement.pdfIn PDF document text
    • http://jigikox.rf.gd/zotajoxedoxuzitofev.pdfIn PDF document text
    • http://kavunuses.epizy.com/zipumiliwex.pdfIn PDF document text
    • http://sezajuvijib.rf.gd/boxosubadizide.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_e03705b1d50d4b65ab72449e1a788cf9.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_9986dee163fb4d97aaa01338e189aa4a.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_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 5648 bytes
SHA-256: 2b20b5584ad39bb344824ebcecc6dd928d3426d3e048ca95d959f627232a5730
font_01_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 10456 bytes
SHA-256: bbf39880aa438589856e77d9cb9bc4d576085a4fb1cd7b021be952ee9b6f92da