Malicious PDF — malware analysis report

Static analysis result for SHA-256 144d7b28b48f074d…

MALICIOUS

PDF

77.8 KB Created: 2021-05-20 16:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 004f992c81662329eb0bdec945e258eb SHA-1: 8d4d0ba318e043313372e192b8ed97265b1d798e SHA-256: 144d7b28b48f074d6dc18f12c0b42d07f06a8790546db6c7c57beaf3ebf9c1dd
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm for phishing or malware distribution. One prominent URL, https://xezojetit.ru/wb?keyword=que%20siente%20un%20bebe%20cuando%20se%20tiene%20relaciones%20sexuales, is directly embedded and likely serves as a primary lure. No scripts were extracted, but the PDF structure and link farm behavior are strong indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/wb?keyword=que%20siente%20un%20bebe%20cuando%20se%20tiene%20relaciones%20sexuales PDF link annotation
    • https://depopuxa.weebly.com/uploads/1/3/4/8/134893869/65a0c251cbb2098.pdfIn PDF document text
    • https://ladetizor.weebly.com/uploads/1/3/4/7/134731735/7996901c3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_6067935f1c7fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468253/normal_5fd9a1b3cbee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_605061af7552b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413575/normal_5fdee41ae7211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476273/normal_5fe6f3599af1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393759/normal_5ff78e564799b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5fea254496d87.pdfIn PDF document text
    • https://lirefabagobaxi.weebly.com/uploads/1/3/4/0/134012393/7260f073957ac5.pdfIn PDF document text
    • https://vaxinukosiju.weebly.com/uploads/1/3/4/6/134625250/tumalopavegito-tagaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_600e7685b9a8a.pdfIn PDF document text
    • https://nufazuxumojo.weebly.com/uploads/1/3/2/8/132815750/duraze-keziruv-buwagem-logosemibebi.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/wanalovum/40361807842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d5440f9-098d-467b-a812-580beed9e03c/zosejilosenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b111fe-3710-41e3-bbaf-6680e3992963/16524670870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27072d0-bbd9-4843-a38c-548cfbe0d925/reropesavezebor.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/91631842679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1263fa82-c9be-4b25-9a0c-466b869cb14a/96707789429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c834d159-a00b-4ce1-aa10-d1e1425c6a5f/18748064555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c5dbfe-7b74-44cf-a8e5-90d55b6fae72/gexomigoxasus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed940374-c20e-42e9-b08c-c79f5384ff08/narrative_writing_graphic_organizer_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/the_last_wish_ship_destiny_2.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/sobemiwimeru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/769091f7-36b9-45d8-a069-9ca40b541eb1/12206643387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/249ed256-671f-484d-8e1c-e657e9449ffc/19821260920.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_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 5204 bytes
SHA-256: a33b22751f0bcf9abf6a04b03e7bee7d1b6bb550613f00fb15bb3b6afe7806b7
font_01_sfnt_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 11704 bytes
SHA-256: a57eddfbd26fcbd27f05e3d16b933123b00e63c2ecb59945694cdfcf08c12a64

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