Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a3c6fd88bb77cb…

MALICIOUS

PDF

92.3 KB Created: 2021-03-03 11:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b22085cf3efeee33f412f15f0e688c7a SHA-1: d7ea2051895ce1d3995c39cbd3fb122fdd3343e4 SHA-256: 76a3c6fd88bb77cbeb8c385367572377c3f499332309e11b715d89846abf3b32
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, identified as a PDF SEO link farm. One of the primary URLs points to a site that appears to be related to search engine optimization or content manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/wix?keyword=cat+ninja+vevo+unblocked+games PDF link annotation
    • https://jaluvipuruwagub.weebly.com/uploads/1/3/4/7/134734890/bunifadajanupesigo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455901/normal_5ff772c8b4778.pdfIn PDF document text
    • https://jugijivarute.weebly.com/uploads/1/3/4/6/134620481/jepoxol-rofuvidiwixe-nabukufep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501965/normal_601eda6be62ab.pdfIn PDF document text
    • http://pokavitapizinuv.iblogger.org/oxfam_and_development_finance_international_report_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475985/normal_600f22dcc919a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449193/normal_5fd685f347465.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/fotepopunaj/5448627626.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/f60_fire_guard_test_questions_and_answers.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/what_is_an_example_of_internal_attribution.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/hot_wheels_3pc_twin_microfiber_sheet_set.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/90125055449.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/93466823309.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off00012e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0D 5408 bytes
SHA-256: bf2539968f40aec20570ee012d8e9ac55e83e978f2dfa390fdb232852d80f8d8
font_02_sfnt_off0001406c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406C 10360 bytes
SHA-256: 816533a8726b1e152e543cbb6c4c09c629c1adcca0ab40fb4e7ae35c85f490fc

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