Malicious PDF — malware analysis report

Static analysis result for SHA-256 2904584a34bef937…

MALICIOUS

PDF

71.7 KB Created: 2021-01-12 01:27:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 17ef56368bf8ef408c9a19485f7279ea SHA-1: 228789e4c99d8be4acb451f010ad49f00a104fcd SHA-256: 2904584a34bef9372c22f5badda506d57f179b6e081993f2c0fedcc10e8b6752
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external links, many pointing to PDF files hosted on various domains, suggesting a link farm or SEO poisoning attempt. The document body, though heavily obfuscated, contains keywords related to search terms, reinforcing the lure. The presence of embedded URLs indicates an attempt to redirect the user to potentially malicious content.

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
  • 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.
  • 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://trafffe.ru/wb?keyword=monster%20truck%20show%20nj%20motorsports%20park PDF link annotation
    • https://cdn.sqhk.co/nazopekujavi/AijRhf4/acrylic_nails_ideas_summer.pdfIn PDF document text
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/mexoluriguzinubeju.pdfIn PDF document text
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/46c1dbe456.pdfIn PDF document text
    • https://benukakaruw.weebly.com/uploads/1/3/4/7/134745121/nopuwodi.pdfIn PDF document text
    • https://dajexave.weebly.com/uploads/1/3/4/3/134352807/5214192.pdfIn PDF document text
    • https://fatumusuwenufok.weebly.com/uploads/1/3/4/5/134578353/muvezo.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/dghtejd/tuvam.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/xih94OS/sogob.pdfIn PDF document text
    • https://bazuxenulasiv.weebly.com/uploads/1/3/0/7/130740357/narifub-tanavonud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368746/normal_5fcd52551622e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/widetunipet/gomonaponufadedoxadev.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/wow_bm_hunter_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/anti_spyware_softonic.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/ifs_zoology_syllabus.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_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 5380 bytes
SHA-256: 7092547dd9d5074aedb467f27551b836097e665c226d1847944183045d89a912
font_01_sfnt_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 11408 bytes
SHA-256: 85e7d90c3d9dfe21bc620fb6bf9a9929ebed36880875991dd671e82ff1e28b16

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