Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c71fb5f413314d…

MALICIOUS

PDF

73.0 KB Created: 2021-02-16 20:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f0fddd6a84d4c5a13dffe90ed246cf85 SHA-1: 93c42be42d4ca539d89a187132a76ba6de71ae5a SHA-256: d5c71fb5f413314d342dde8e1b94f57e08a78f14e41f32c82798b67ec1356f48
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many of which are hosted on dynamic DNS services or cloud storage, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=thinkorswim+real+time+quotes PDF link annotation
    • https://cdn.sqhk.co/dojidavos/jahagip/fruit_harvest_time_georgia.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/IiiMhfB/star_falling_down.pdfIn PDF document text
    • https://cdn.sqhk.co/zozijawutuxu/ahaiiaI/gulaparevusabinor.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/EieX1K3/pubg_m24_gun_sound_download_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/ZFDjcgh/43568313192.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/bmjgjjw/ben_10_omniverse_2_mod_apk_download.pdfIn PDF document text
    • https://dewokipapofoz.weebly.com/uploads/1/3/2/7/132741709/xobaseveroz_wilafi_tofatagipuve.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/sajezife/ajith_hits_songs_tamil.pdfIn PDF document text
    • http://taxifegizuni.epizy.com/kuwufinubovimobup.pdfIn PDF document text
    • http://duwimufowewis.epizy.com/pakotu.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/rubaravesetuke.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/jufajamo.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/70257954329.pdfIn PDF document text
    • http://nogojituwizax.epizy.com/view_jacoco_report_in_jenkins.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/besakiwom.pdfIn PDF document text
    • http://wagupamodesugub.rf.gd/joxilisekagominogiluzisa.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_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 5156 bytes
SHA-256: 4938eff7fe48a2e63f45a55448ab271408b3ff767f851c1549e979d0b8178370
font_01_sfnt_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 10964 bytes
SHA-256: 14e27327502e83c4c49c1cd7266a84c3fd3168a1e2f2eb2b59c6bdc17d090544

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