Malicious PDF — malware analysis report

Static analysis result for SHA-256 e169754b87d4fbe8…

MALICIOUS

PDF

85.2 KB Created: 2021-04-12 00:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 12e98839ebb77ea150f6713fb3a2f92b SHA-1: 62ac97d637070d18214c23f249ed145645cbc6ef SHA-256: e169754b87d4fbe89cc2b6751a80102441ea01bb196fe39a1a97ee2a060e7dac
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The primary attack pattern involves a link farm, with numerous external URLs pointing to other PDF documents, likely for SEO manipulation or to host further malicious content. The embedded URL `https://resalured.ru/strik?utm_term=logic+puzzles+with+answers+for+adults` suggests a lure related to puzzles or adult content to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://resalured.ru/strik?utm_term=logic+puzzles+with+answers+for+adults PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491725/normal_5fe3d7d3a379c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412158/normal_600665d7d09a0.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/44008ee19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458827/normal_6054e9aaafa40.pdfIn PDF document text
    • https://notolunezoxab.weebly.com/uploads/1/3/4/8/134846452/cf26ad33d36b4a.pdfIn PDF document text
    • https://ganubidorebe.weebly.com/uploads/1/3/2/7/132740923/fewojugosuwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468537/normal_600062dedd3e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_6040e10ed9ae9.pdfIn PDF document text
    • https://munivimisidifi.weebly.com/uploads/1/3/4/7/134772296/xobipudepilav.pdfIn PDF document text
    • https://vewosofi.weebly.com/uploads/1/3/4/4/134493368/xotumok.pdfIn PDF document text
    • https://jovuwimuj.weebly.com/uploads/1/3/0/9/130969820/3278184.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478131/normal_5ff13db786afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477167/normal_5fd5ffdbd1e3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_6040bbb115e7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490953/normal_601dda3c088e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422638/normal_5ff1e3444c279.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446489/normal_5fcb6a7a4c99d.pdfIn PDF document text
    • https://sanegirorasatu.weebly.com/uploads/1/3/5/4/135400744/989a3081.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/ac62ccc3-9ac3-4e33-8a70-e6f734282a44/ipod_nano_3rd_generation_8gb_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb5fb0c-4e3b-47c3-bf50-9fb897795531/the_ministers_black_veil_study_guide_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59372a5f-9d53-403e-9307-a52e3592da38/sisusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cba90d3d-9f35-4e6d-9615-8a9a1f0e7815/kanewivitugijejekix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e5d855-af0a-412d-b974-95aafad3c70c/sukamoroxak.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_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 5500 bytes
SHA-256: 198c075ccb8a5bab45f2cd39226272e6fad92f4490343eb7275095d17e22b99e
font_01_sfnt_off000121fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FA 11000 bytes
SHA-256: f86e7814f50d970e641ac58e026e0e725375c76eec39b2a4eda1fbc4dc0d60eb

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