Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5e9239b410f682…

MALICIOUS

PDF

74.7 KB Created: 2021-03-07 16:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd22798dd4c18649bc8e07f8f66e8a69 SHA-1: 7e6dec3b5ec319fc51902efe548153c08a906054 SHA-256: 3b5e9239b410f6827b31f6cbc0b4f955648c21155ab7318f1573ce04fa8984ff
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The document body, though heavily obfuscated, appears to be related to search terms, further supporting the SEO manipulation or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=what+is+the+best+carpet+cleaner+machine+to+rent
    • https://lipigilukezi.weebly.com/uploads/1/3/5/3/135347924/bulupajalesunid-donedamimafivu.pdf
    • https://jesuzexujugom.weebly.com/uploads/1/3/0/7/130776612/5280247.pdf
    • https://guxevelanitab.weebly.com/uploads/1/3/4/7/134769418/tomuzopab_motamilagen_kobukov.pdf
    • https://xowebanum.weebly.com/uploads/1/3/1/4/131453595/gibugipupedun-fadadejarogo-xelosuwadigato.pdf
    • https://fomoxizukewoviw.weebly.com/uploads/1/3/0/7/130739072/fobafite.pdf
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/5504113.pdf
    • http://zupibupiju.iblogger.org/83328058694.pdf
    • https://katesagi.weebly.com/uploads/1/3/4/8/134864962/negadulanifixola.pdf
    • https://xowitato.weebly.com/uploads/1/3/0/7/130776358/dusamupo.pdf
    • http://mexicotop3.xyz/sebaximebivaboziex7gy.pdf
    • https://xuboxale.weebly.com/uploads/1/3/1/4/131452808/fezitubi-gujudo-jimilix-pixaked.pdf
    • https://pozopili.weebly.com/uploads/1/3/4/3/134310053/rubupoli.pdf
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/613d111f110d.pdf
    • https://dirogine.weebly.com/uploads/1/3/0/7/130775503/xopeko.pdf
    • https://xokijawajix.weebly.com/uploads/1/3/4/7/134726357/393b35114.pdf
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/2b017078ff57.pdf
    • http://donbetosstreettacos.com/211587969197yfjv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xivubijorudi.epizy.com/terewobomanesagujazagi.pdf
    • http://bogisuxefitis.epizy.com/24436248132.pdf
    • https://uploads.strikinglycdn.com/files/ff8f9974-af0d-42c3-9210-3bfe09899673/65276610378.pdf
    • http://gunexukod.epizy.com/jobs_worksheets_for_1st_grade.pdf
    • https://uploads.strikinglycdn.com/files/b1ad9ab5-49b9-4561-b0f7-48523668bce8/easy_way_to_learn_quran_online.pdf
    • 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_off0000e88c.bin
8edc184e9726f95dd4e896f24a1ce462b7d6a6baac47d5ba9c2572c565f75f29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 5324 bytes
font_01_sfnt_off0000fa83.bin
07b3a28038a7179ee859f9878d976e6e708e51244ac5f78c93d863957e3a93e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 10004 bytes

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