Malicious PDF — malware analysis report

Static analysis result for SHA-256 723a59ffc6b88684…

MALICIOUS

PDF

94.9 KB Created: 2021-02-03 01:58:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 992ddf8afc06ec9f0b24df0879a06de0 SHA-1: 39a539faf442e0dad1c325ca353821791d64cc7e SHA-256: 723a59ffc6b88684602f064c7e5d6947feacf07f285f6484dbcd87b343b3db00
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including ClamAV detection and a ML classifier. It contains a large number of external links, many of which point to known malicious redirector infrastructure or are part of a link farm. The embedded URLs suggest an attempt to redirect users to phishing or malware-hosting sites, likely disguised as helpful documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=ipod+shuffle+4th+generation+quick+start+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4492257/normal_5ff2812ac7d2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466666/normal_5fe1d8aedd5b1.pdfIn PDF document text
    • https://donabetolemi.weebly.com/uploads/1/3/1/6/131637402/78861f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471703/normal_5ffb7cf8dd6bc.pdfIn PDF document text
    • https://murexaxinafol.weebly.com/uploads/1/3/4/4/134456221/wusigowamasakuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480393/normal_5fd6485605ff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404296/normal_6018ee1111f3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447663/normal_5ffac6f98e7f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383451/normal_5ffc9dcc891ec.pdfIn PDF document text
    • https://wunovolal.weebly.com/uploads/1/3/5/3/135311751/nalesitawagol-fovaxoseval.pdfIn PDF document text
    • https://wudonazig.weebly.com/uploads/1/3/4/6/134675044/cb8ee4111c11e0.pdfIn PDF document text
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/daadec30c1923.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fofeguj/co_parenting_schedule_template.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/avengers_endgame_blu_ray_4k.pdfIn PDF document text
    • http://pemukusa.epizy.com/migosedalikerejego.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/jidufudoni.pdfIn PDF document text
    • http://raseloxezonavo.epizy.com/99870765788.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/geometry_polygons_worksheet_grade_4.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 5560 bytes
SHA-256: 8e93e33b9767030e3b2af315c0c11ef7b4339582f6c289844ab99c558445c61d
font_01_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 5516 bytes
SHA-256: b3eb9a9584c5ea84f7a78e5a9c76fcd94d972e07db418dd65534779bdf86f6e9
font_02_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 5972 bytes
SHA-256: 1b62f3e0e9f3b36faa3cc4782891da307373f387d8bb5664c7988a126f27c7bb
font_03_sfnt_off00011a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A69 13680 bytes
SHA-256: 8811235cb2bde165468454fa0688d522538c03baeef8f3ed3f59c857ad94d719
font_04_sfnt_off00014561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14561 16684 bytes
SHA-256: fe1ca6a691315ef32827512bb86cd3188d7c30cfa02bd4559714794831c9b14a
font_05_sfnt_off00015c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e