Malicious PDF — malware analysis report

Static analysis result for SHA-256 439ef042c4f522cc…

MALICIOUS

PDF

71.6 KB Created: 2020-11-24 22:02:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ea0d090b734a7c415a95da021a709452 SHA-1: 90e395cbc3e530c0c868fbd77c96f586663936ce SHA-256: 439ef042c4f522ccce6cbbc5ae2b55df84f7e261adc8a02de27668dcf719886a
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The file contains a large number of embedded URLs, suggesting a link farm or phishing attempt. While no scripts were extracted, the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent, likely to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/strik?utm_term=popular+congolese+boy+names In PDF document text
    • https://kubamugikogili.weebly.com/uploads/1/3/4/5/134508843/webixuro.pdfIn PDF document text
    • https://sebupemisopuba.weebly.com/uploads/1/3/4/7/134706320/f42c67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0209f75-fbd8-4975-bc5b-312f18d7eacc/cal_state_long_beach_housing_map.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/1980_st_charles_west_high_school_yearbook.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/pixel_gun_hack_app_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/jiwuf.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/12351060487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec3aef9-2e33-4dfc-863c-fca3939da480/19302785424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2765b64c-f6c1-4c5e-a286-7bfea4bfe1a3/jixafegepir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95f7dfab-3936-4514-b8bd-407f815022d0/43240271892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a15cbc-88a9-4470-b22d-a8f36cbe2f25/56644805576.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/boondocks_season_4_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/music_bump_of_chicken_ray.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB70 5496 bytes
SHA-256: 0161cf1d79b5c790b497137b6c8df4e65453fdc1c6e932cc1080dff5389ff378
font_01_sfnt_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 10608 bytes
SHA-256: 6703689747a99e990bab46f7bae697980f0be89b78463a7681dbde5a7e1fe05c

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