Malicious PDF — malware analysis report

Static analysis result for SHA-256 900d25ec104161ad…

MALICIOUS

PDF

83.2 KB Created: 2021-03-16 19:26:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6d46c2e69b1986a6eddd50405d68022 SHA-1: 23456bd57cdf8de38fa88d34661b83ab2815adaa SHA-256: 900d25ec104161adde2cb8f8fb6f094ef16d3516b1040bf45537a33924a4425a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/award?keyword=l+islam+et+la+science+ernest+renan+pdf
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/8347163.pdf
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/8b6796a77631d.pdf
    • http://vopagokiniki.mypressonline.com/ryujin_3.5_cp.pdf
    • http://tosefabebiribow.scienceontheweb.net/puselidadano.pdf
    • https://xabisipejerifo.weebly.com/uploads/1/3/4/6/134634854/434107b2c.pdf
    • https://vonarepovuwogi.weebly.com/uploads/1/3/4/7/134728891/bbfa4691cd6.pdf
    • http://ribavid.medianewsonline.com/sagavegetur.pdf
    • http://bopolubolef.mywebcommunity.org/barrons_gre_22nd_edition.pdf
    • https://tabekemaw.weebly.com/uploads/1/3/0/8/130874329/8765611.pdf
    • https://nazorilorapumug.weebly.com/uploads/1/3/0/7/130776423/89d3311f192.pdf
    • http://dududuw.mypressonline.com/92587954949.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xixonu/15775416976.pdf
    • https://s3.amazonaws.com/muvarelo/3586174093.pdf
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_54e95ef966fd475cb11a61e4a41832b9.pdf?index=true
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_6a2d1caeeceb4e419ef706d2e40e7265.pdf?index=true
    • https://s3.amazonaws.com/redegelesibif/45300656162.pdf
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_4411d5aff8d84278a6c21608fdf9ac19.pdf?index=true
    • https://s3.amazonaws.com/viboxikuz/39507649817.pdf
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_1cede5ae9fe2497f887a754235f08a0d.pdf?index=true
    • https://s3.amazonaws.com/jedobufudajewu/dell_7010_sff_i5-3470.pdf
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_cb09c367b51d45608530607a1745850a.pdf?index=true
    • 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_off0001047a.bin
42382134ae935da5d8cd3bff4b959ccee464f5d67cb35759b8e1e6c5b1f87e60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 5240 bytes
font_01_sfnt_off00011639.bin
fcfa6861261c036c6aa8ea6d58170e3885a65cdd72a595ed5ed0739a3b10c80f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11639 12616 bytes

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