Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2a10df97bb854b…

MALICIOUS

PDF

78.2 KB Created: 2021-02-24 07:14:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 147ed952abcf5242f77ad3a5eef935d0 SHA-1: 8669d2d74502ef3fc6214ef563398de0542f3198 SHA-256: ae2a10df97bb854beecd54915d68ce0c81181a1a95e22561b4e5b48caacc6a5b
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wb?keyword=how%20to%20make%20adjectives%20plural%20in%20spanish In PDF document text
    • https://cdn.sqhk.co/nozelenid/jiejchh/60237725303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498376/normal_602caff3473a9.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/ZMajcbI/34351563780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_602034b4c5e42.pdfIn PDF document text
    • http://raxebazidalorow.22web.org/wizard101_pet_jewels_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/ia9gX2f/segiga.pdfIn PDF document text
    • https://mibuvenatevuwo.weebly.com/uploads/1/3/4/6/134607329/davejoxidaxar-vemebitik-noxoxifewomosef.pdfIn PDF document text
    • http://zespodsvetkoy.site/guided_reading_level_henry_and_mudge_take_the_big_testwa56x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451932/normal_601db2c376df0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418178/normal_6007e37cc5aa2.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/zuvovoxigumuz/99499970305.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/59639862802.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/2016_movies_tamilrockers.pdfIn PDF document text
    • http://roxuriwiladubew.rf.gd/zixekunatawixuromuzudo.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/20889517383.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/15348162248.pdfIn PDF document text
    • http://jogubemiviju.rf.gd/73508621970.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_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 5564 bytes
SHA-256: 913652120c80ddd07051d81d32edfe1953b7e1d214fd305bc62feb5fc8c9d8aa
font_01_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 11240 bytes
SHA-256: 7f959ec4a8852fb942abdf7b03ea1ae2349529ca79d409858cc6c55ba0b0107d

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