Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73f9ade9a10471c…

MALICIOUS

PDF

74.8 KB Created: 2021-03-29 07:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b78847dbb64d9d8d8979470a54c4d45d SHA-1: bc89fac86a5ee5c792b2765ed468e926e1880e35 SHA-256: e73f9ade9a10471cb38c99cbca6d26da1c5d9d97afbf33b444c93e8b47261f81
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as search results or informational content. The presence of a 'download button' heuristic and the ML classifier's high confidence score suggest a malicious intent to trick the user into downloading a secondary payload. The ClamAV detection further supports this, identifying the file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=hayward+salt+cell+reset+after+cleaning
    • http://forkidsshop.online/gopro_hero4_silver_firmware_updateti2jb.pdf
    • http://ranking-se.com/wovawav83ip0.pdf
    • http://josebixotarez.22web.org/tolotisuzolulokiz.pdf
    • http://usacreditreport.info/dnd_5e_critical_hit_damagegkflk.pdf
    • http://itslm.fun/zakaseduvzjcx.pdf
    • http://golosa-spasibo.ru/dunkin_donuts_ingredients_chocolate_frostedsuee2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lekizopiloref/excuse_me_in_korean_informal.pdf
    • https://uploads.strikinglycdn.com/files/a60d674c-ced0-4715-9249-64286e16a50f/85037531762.pdf
    • https://uploads.strikinglycdn.com/files/c7b542e9-008c-4ad4-8cf5-823a8fd09965/usmc_junior_enlisted_performance_evaluation_system.pdf
    • https://s3.amazonaws.com/xuzakob/52016019312.pdf
    • https://s3.amazonaws.com/vokeri/vinanugaxalafew.pdf
    • https://s3.amazonaws.com/palevijuj/nekoxisibiratiwomelas.pdf
    • http://dibawuleseba.rf.gd/electric_start_honda_pressure_washer.pdf
    • https://s3.amazonaws.com/vabemavuputenif/38341460928.pdf
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_3ba1895f567d45e2a51408366880c95f.pdf?index=true
    • https://s3.amazonaws.com/girilifawuxi/rebejoguvopufatikutenuki.pdf
    • https://uploads.strikinglycdn.com/files/5d95ffc3-1316-41c0-acde-09567fec7a21/49467165475.pdf
    • https://s3.amazonaws.com/lixuzo/data_science_course_in_india_with_placements.pdf
    • https://uploads.strikinglycdn.com/files/31750d02-129b-4e8c-912e-37513a055278/ribhu_gita_download.pdf
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_beca9e2fa5974a92a6476fdd6373e154.pdf?index=true
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_866759d0b8ec4efcb8ae92e8becdae5f.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_off0000e5e7.bin
a17b16abf31ba86c94090caf8e6b6b3941fb464ec3f54a63040b70437047c5dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 5344 bytes
font_01_sfnt_off0000f83f.bin
577dca5acbb3380ba10fb35ac30b041865510629bd2fd6bc4d2cbdaa4e80127f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 11036 bytes

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