Malicious PDF — malware analysis report

Static analysis result for SHA-256 348910f4c8b1c28b…

MALICIOUS

PDF

99.1 KB Created: 2021-04-06 19:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51c883ac79ac7e6df2b9cb7815c09aed SHA-1: 91348de23d3a04b737cb687bc5e8637103185522 SHA-256: 348910f4c8b1c28b0385ea875bfe8a177d744cc035046d685827746ae7dacdef
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan variant. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or content-serving lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/award?keyword=biocalculus+stewart+pdf
    • https://bozofapenori.weebly.com/uploads/1/3/5/9/135965419/5724ba0402d49.pdf
    • https://cdn.sqhk.co/naruxibe/jqngihb/novipavabozul.pdf
    • https://cdn.sqhk.co/gufezitaxato/ejbhhzX/99906573641.pdf
    • https://vafoguvisijun.weebly.com/uploads/1/3/4/8/134887412/nozanuvososega.pdf
    • https://dixatuwep.weebly.com/uploads/1/3/5/3/135398053/supevuzesema-foxivogute.pdf
    • https://putofikanavo.weebly.com/uploads/1/3/0/7/130738484/pulebage.pdf
    • https://cdn.sqhk.co/zetobazox/zgcDtii/rope_bottle_carrier.pdf
    • https://gelejidog.weebly.com/uploads/1/3/4/6/134688201/mogezabukovebuzos.pdf
    • https://cdn.sqhk.co/kadeposamo/Kibaojd/59171351114.pdf
    • https://natutiwuv.weebly.com/uploads/1/3/6/0/136019317/7880da71.pdf
    • https://cdn.sqhk.co/dewufidabo/C7ieiiM/granny_chapter_two_mod_menu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e2556764-ee6d-49fa-95dd-da3b34a41a76/the_witcher_3_wild_hunt_complete_edition_guide_prima_official_guide.pdf
    • https://uploads.strikinglycdn.com/files/e600f817-d35f-417b-8c61-df4a6b3c2f1b/popular_visual_culture.pdf
    • https://s3.amazonaws.com/tanikanaw/durgai_amman_hd_video_songs.pdf
    • https://s3.amazonaws.com/xeropizuwe/25769964400.pdf
    • https://uploads.strikinglycdn.com/files/00e3fb4d-ae29-46bf-9ad2-5710f7b5c70b/sunirefakax.pdf
    • https://s3.amazonaws.com/nefunupu/renaissance_faire_2019_las_vegas.pdf
    • https://s3.amazonaws.com/liwafo/wipikomunizegaze.pdf
    • https://s3.amazonaws.com/feseni/comedy_central_netherlands_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001498a.bin
46a7fa04f09ce7dc4ee5a4b040268ecd27f774318e8116fb66b578b70f8790cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1498A 5288 bytes
font_01_sfnt_off00015baa.bin
05dfacb6426e1e4510eb33c15aab82b88b66d09d43ce5712e14470bbbc202195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAA 10616 bytes

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