Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfa382858bae7d1…

MALICIOUS

PDF

95.6 KB Created: 2021-04-08 05:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d682b4f3bc56514bc070bc7a5ebc4529 SHA-1: 85405587cf90cc4a172efe1ce166b9683e7f3556 SHA-256: 4cfa382858bae7d11046766b7b5cca469e2b0c0d879615760bb092f5fb89a985
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 0.9996

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://crophysi.ru/wb?keyword=what%20animals%20represent%20the%20greek%20gods PDF link annotation
    • http://miiliioner.xyz/nizipojiziravijoswccbh.pdfIn PDF document text
    • http://instasurprise.online/campaign_monitor_design_templatesnxa0k.pdfIn PDF document text
    • http://9gusevshop.website/iihf_world_hockey_championship_power_rankings35t3h.pdfIn PDF document text
    • http://dayzcommunity.info/chrono_trigger_switch_release_dateoh0wn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/patotale/42189228094.pdfIn PDF document text
    • http://senoburem.epizy.com/71930051013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c344ab3-8880-4b14-ae3d-b0f08f4c0d5b/15787412014.pdfIn PDF document text
    • http://pitupeg.epizy.com/watoriruvepenujof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ff3fe9-9e92-4c97-b7eb-69c938432d9c/avaya_2420_cancel_call_forwarding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61aa60de-e473-48cf-b896-6db199acd97c/killing_floor_incursion_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/robert_blitzer_algebra_and_trigonometry_6th_edition_pearson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc11d7e-814a-482c-9a4e-293c76518160/14967572821.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/interpreting_linear_graphs_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdebc474-2fb1-44c7-9052-bdee23d2438d/xaxaxusigegananoben.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f748075e-2859-40ff-b496-f4f1bc37c0b0/what_does_the_enchantment_projectile_protection_do_in_minecraft.pdfIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_38d5d8275939401fb658d65ab28dae17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/votisovabokajulumebipager.pdfIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_92ab3b64d9c34c27b595d7791b38c6ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab286a36-3de9-44b7-9da3-52e91622c605/xuvikolusezowuzokux.pdfIn PDF document text
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_02416bf14f8e4142b40b748fc7899315.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_373083913b1b40aa86fe6b24df93e28f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c6cb71d-72e2-42c3-b6cc-1434c579407b/14417493495.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_off00013996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13996 5452 bytes
SHA-256: 68e8a21c046876778395cb6eb753509354810ce166b5f452f37c9a7371f0a3c3
font_01_sfnt_off00014bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFA 10856 bytes
SHA-256: b54aca51e9a468075232ba7b65587eb696bc58a170e5c182a95918552627f58c