Malicious PDF — malware analysis report

Static analysis result for SHA-256 838db42b59b8c707…

MALICIOUS

PDF

78.9 KB Created: 2021-03-09 20:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7a51c946874153916ddf810d7c3286eb SHA-1: d510d3356065b55afc13e11ef9aef01d36e45658 SHA-256: 838db42b59b8c7072012915c821609700f42ebbd24f27414b246c760d3234ed5
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, many of which are part of a link farm designed to appear as search results for various topics. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically phishing or malware distribution. The embedded URLs, such as https://crophysi.ru/award?keyword=exercice+anglais+a+an+the+ou+article+zero+pdf, are likely used to redirect users to malicious sites.

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/award?keyword=exercice+anglais+a+an+the+ou+article+zero+pdf PDF link annotation
    • http://zexofezureza.iblogger.org/panasonic_viera_tuning_problems.pdfIn PDF document text
    • http://loberas.22web.org/because_the_internet_album_zip_sharebeast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kapigazezej.epizy.com/boy_scout_store_memphis_tennessee.pdfIn PDF document text
    • http://lejagimu.rf.gd/the_warrior_method_intermittent_fasting.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/dmt_trip_report_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/girofewa.pdfIn PDF document text
    • http://telefepoxuxoxis.rf.gd/ireland_pronunciation_guide.pdfIn PDF document text
    • http://bosadubarelazu.rf.gd/zimapevibuluwe.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/athens_map_tourist.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_5eec388fe88540ecb986577b046a7500.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/32890453633.pdfIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_5d107ea27d24456183cd7ab8ead59771.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/4906781125.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/cell_biology_quiz_questions_and_answers.pdfIn PDF document text
    • http://xelidamos.epizy.com/47707895630.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/iso_31000_risk_management_training_online.pdfIn PDF document text
    • http://setuvufijub.epizy.com/agile_software_requirements.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 5492 bytes
SHA-256: 28d262e204d73d45d78bad80c16cb27270907cf48ddf083d6fe77f864cbdde8a
font_01_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 10672 bytes
SHA-256: 375fc47d59626f5d483846a6d4cfb1d45f526f5077ed5c63f465c86086a7528b
font_02_sfnt_off000118ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CE 16244 bytes
SHA-256: 3cc505d749f3607be07d7baafe615a79d7d30ab73d6eaddd263d955b55949271

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