Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba887115c0a390d…

MALICIOUS

PDF

72.3 KB Created: 2021-03-11 09:14:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c6c8a20ad3ce88292bc0f9e8250cb90d SHA-1: 5c99475ef2cc78b9d6429e92c8cf3050151ddcf0 SHA-256: 5ba887115c0a390d93fa3efbfad70fbe15a9a1039fff2c086ed581741db78482
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://zajinet.ru/award?keyword=classifying+triangles+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369914/normal_6011d5f7d1051.pdfIn PDF document text
    • http://dubejug.iblogger.org/does_in_a_sentence_for_kindergarten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_5fe6ca3beb366.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/ijkTUiU/fujitumusaluwojefox.pdfIn PDF document text
    • http://labiluwewinedu.22web.org/88350347751.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/bheeKjb/bomberman_classic_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pibegufuxova/ikiageK/halsey_colors_piano_sheet_music.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/98cbac85-8afd-4078-9f2d-8ea1d5c7d376/43692161348.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/15338425591.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/netflix_source_code.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/brazil_food_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a453987c-b14a-4ede-9e77-4c025fce2b11/57760007203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73884534-7376-4e2c-96b8-c26311f4427e/65734615887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe801ff-4bb7-4bb8-9cf5-bf9f983506ac/95111047108.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_f17ccb9003774c5486b510d9c8ff138f.pdf?index=trueIn PDF document text
    • http://nilixedenoxim.epizy.com/xebaxuvetasofofazeguzopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4124dd-216d-4853-95f4-d9a4a3e9a078/will_festivals_happen_in_2021_uk.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_752046d392ea49a49eb8c50ed56dbe44.pdf?index=trueIn PDF document text
    • http://jegerusomeku.epizy.com/why_wont_my_water_dispenser_work.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA0 5216 bytes
SHA-256: 6a0f73fb613932d17f41ed47e034d353cb83be3cd5f92ab83e53455f7b56d983
font_01_sfnt_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 10196 bytes
SHA-256: d42b058445fb334c203c7c7d90437c39e4d9451e845cc78df17a70888349b2d2

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