Malicious PDF — malware analysis report

Static analysis result for SHA-256 4145a982c435a7c2…

MALICIOUS

PDF

82.9 KB Created: 2021-04-21 21:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 237ed452767a90889caa4b81a0b3e787 SHA-1: 81c4ac17d51ee89fa8686b4bd891f5804763fa27 SHA-256: 4145a982c435a7c2f818943c431afd1ecec0583e9e5e5f099d6db3b67e92ef58
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of external links, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://nipisod.ru/strik?utm_term=caron+yarn+color+wheel, is particularly suspicious and likely leads to a malicious payload or phishing page.

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://nipisod.ru/strik?utm_term=caron+yarn+color+wheel
    • https://kigijogi.weebly.com/uploads/1/3/4/7/134702755/6701041.pdf
    • http://cherrypimp.online/what_is_conversational_style4k50d.pdf
    • http://tarekupi.scienceontheweb.net/6716355342.pdf
    • https://falototadapi.weebly.com/uploads/1/3/3/9/133989324/dac47f6238a66b7.pdf
    • https://leresidatebij.weebly.com/uploads/1/3/0/7/130776374/gakekifereru-funubi.pdf
    • http://joxitikoki.getenjoyment.net/92213029459.pdf
    • https://zidipezes.weebly.com/uploads/1/3/5/3/135314083/nofanez_zugibosanoxed_moboborixusav.pdf
    • http://uplrezina.site/52631864532jxgo0.pdf
    • http://mofirixubutibi.getenjoyment.net/master_degree_study_plan_sample.pdf
    • http://kemytbok.xyz/biblia_peshitta_enx9jjd.pdf
    • https://kiwosadil.weebly.com/uploads/1/3/5/3/135384828/9016763.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tixedujegibex/the_retirement_miracle_book_edition_patrick_kelly.pdf
    • https://uploads.strikinglycdn.com/files/5d2dbf2e-a4fb-445d-9344-30de0d90620e/how_to_test_a_schumacher_battery_charger.pdf
    • https://s3.amazonaws.com/rafiralexezol/ledivujokala.pdf
    • https://s3.amazonaws.com/wunupalezozerud/45222306136.pdf
    • https://s3.amazonaws.com/jopomodilamego/how_to_count_hydrogen_atoms.pdf
    • https://uploads.strikinglycdn.com/files/b1cd16fb-63a6-4785-bb91-9ccd99374c9d/mulifonakevowamazazes.pdf
    • https://s3.amazonaws.com/tejuvonixag/8658854750.pdf
    • https://s3.amazonaws.com/gopuze/anthropologie_formal_dresses_sale.pdf
    • https://uploads.strikinglycdn.com/files/7adfa41d-3651-403d-bcae-ec8c3d439dc1/70992414223.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_off00010ace.bin
558325600e1c1b125f5344142cb03c34f5160aa1f037d656fbf9bc314e30940c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 4808 bytes
font_01_sfnt_off00011b39.bin
8c0e21b6ae6774976d5a5125342bda1d6f0f35f15a1587bf883982c476aa5a7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 10452 bytes

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