Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d4183bcbed32bf…

MALICIOUS

PDF

81.9 KB Created: 2021-03-03 10:05:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b671fd3bb62a3eb23d5d5aab23095d63 SHA-1: f0cf0835419b61c52b2f56f83a7a155ed6af923e SHA-256: 55d4183bcbed32bf580afeeb52825fe87f87d3b96f011938b463406dd5053434
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host a large number of external links, likely to phishing or malware sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users to malicious URLs. The embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=camera+parts+labeled PDF link annotation
    • http://ashotik.space/tutu_app_not_ing_2019ey7rq.pdfIn PDF document text
    • http://bibilewixan.iblogger.org/71307806034.pdfIn PDF document text
    • http://brosbass.com/morejlxwma.pdfIn PDF document text
    • http://dogosufomume.iblogger.org/forinujakijowatug.pdfIn PDF document text
    • http://masajsalonunuz.com/definition_of_cultural_globalization0waxx.pdfIn PDF document text
    • http://basvuruizleme.online/21431232590fkdjl.pdfIn PDF document text
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/gedatudez-foduxozoxe-begejuzow-rititeg.pdfIn PDF document text
    • http://art-practice.org/zewurederinowisitokup4azc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://salilizuvozel.rf.gd/vavituzozabofi.pdfIn PDF document text
    • http://fojepik.epizy.com/articles_worksheet_for_class_1.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/79596186835.pdfIn PDF document text
    • http://susupufewowe.epizy.com/oxford_book_of_latin_american_poetry.pdfIn PDF document text
    • http://gipomafusabakix.rf.gd/new_cg_song_2019_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/android_developer_news_blog.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/sapapoxizexenabevulusir.pdfIn PDF document text
    • http://xavisijividefo.epizy.com/are_automatic_or_manual_cars_faster.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/bonobos_guide_shop_near_me.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_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 5148 bytes
SHA-256: 4dfc9bcc0431f9c49a41b2796f69007e437aa9b2fd79c084a712f95e36805dda
font_01_sfnt_off000116d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D3 10528 bytes
SHA-256: c423191a94063af03f1662c27085d0f2d88e61440559422ad8a31d97bcae0e8c

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