Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85eea2499aa6feb…

MALICIOUS

PDF

79.4 KB Created: 2021-03-17 02:33:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcf8cc688851dbc8bf9fd70e32e5bc4c SHA-1: 7fe5555d610e5552dbc2393188955833ac49d3c3 SHA-256: f85eea2499aa6feb764c2845b3b8c3a42ca7d28d4f8220cbc5836167aed840bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with a primary suspicious URL pointing to 'lozipotod.ru'. Heuristics indicate a PDF link farm, suggesting an attempt to distribute malicious content or redirect users to phishing sites. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

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://lozipotod.ru/award?keyword=lp+stemi+anteroseptal+pdf
    • https://silolovafek.weebly.com/uploads/1/3/4/7/134724041/mekufusigit_vixalo_kovetuvo_sumag.pdf
    • https://balabirow.weebly.com/uploads/1/3/4/6/134690292/jatixuteg.pdf
    • https://deremorukoj.weebly.com/uploads/1/3/4/4/134490203/9574866.pdf
    • https://sifoginugiji.weebly.com/uploads/1/3/4/5/134588619/8029279.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d58ac14e-b796-48f5-abf8-c25af94abdac/varatuxen.pdf
    • https://s3.amazonaws.com/silubebebefuju/tukosasevabirumer.pdf
    • https://s3.amazonaws.com/gajakelegeza/invisible_man_ch_25_summary.pdf
    • https://s3.amazonaws.com/viregujipowuru/12403099955.pdf
    • https://s3.amazonaws.com/juvuraguvutoxif/bootstrap_4_ebook_free.pdf
    • https://s3.amazonaws.com/paropabaru/94099380376.pdf
    • https://uploads.strikinglycdn.com/files/90a6a1d6-9bf1-4d60-9de8-3959c7e34730/kalapu.pdf
    • https://s3.amazonaws.com/sepawi/70271075329.pdf
    • https://uploads.strikinglycdn.com/files/3cb69743-1521-4180-b2d0-f5b2996c1661/interview_with_the_vampire_armand_quotes.pdf
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_3eef839b0b5f44f3b67b1bc0674ebe23.pdf?index=true
    • https://s3.amazonaws.com/kevava/jupemawajixarurem.pdf
    • https://uploads.strikinglycdn.com/files/acc5ad90-7f31-412a-bb03-b1eebb8a4533/how_to_make_your_script_better.pdf
    • https://uploads.strikinglycdn.com/files/193c5a77-788b-4280-9d9e-bd7dbb3cf39b/gasiboveruxitopifib.pdf
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_b908db3027c8484898e4033ab1bf4c50.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_off0000fa8e.bin
f99acc97639c2e1868be29556d74812b7e7452263dd5880fcde7594e49fbc7d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 5128 bytes
font_01_sfnt_off00010be7.bin
532b5c1ca9efabcce16d4b4f4694fd72651e0d71786b7b28cb968c1d96851813		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE7 10772 bytes

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