Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d82d662a1cbe8a5…

MALICIOUS

PDF

76.2 KB Created: 2021-03-22 13:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 17400e2d0ea99407f4177efb5771abc7 SHA-1: 6796850ca637b3c94f318f926d0d378763d36592 SHA-256: 9d82d662a1cbe8a5d93c192806641d2048d726c1edad875e1bfb79039f3fa09f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The primary URL, 'https://jacksth.ru/strik?utm_term=how+to+measure+milk+for+baby', is likely used to redirect users to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://jacksth.ru/strik?utm_term=how+to+measure+milk+for+baby PDF link annotation
    • http://misifebofol.mywebcommunity.org/cvc_e_words.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/fonojilosokedopa.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/comptia_a_study_guide_10016vzjq.pdfIn PDF document text
    • http://itdiscount.info/61806917039qolgj.pdfIn PDF document text
    • http://jusekod.iblogger.org/digital_marketing_jobs_burlington_ontario.pdfIn PDF document text
    • http://kukukoboda.22web.org/sofuxibo.pdfIn PDF document text
    • http://newsportstechnology.ru/miridupazofdhvh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tivurazug.rf.gd/hp_officejet_7612_printhead_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5e70734-a753-49eb-97bf-3cd2543f5427/85747280620.pdfIn PDF document text
    • http://ruvuvata.rf.gd/amnagement_du_territoire_au_sngal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35655fc-5e52-418c-8e42-b7bdeb6fd383/emerson_quiet_kool_air_conditioner_filter_replacement.pdfIn PDF document text
    • http://fotopokidag.epizy.com/before_we_go_english_subtitles.pdfIn PDF document text
    • http://reduxaxu.epizy.com/kannada_voot_app_money.pdfIn PDF document text
    • http://fuvamawijivef.atwebpages.com/retail_pharmacy_business_plan_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9aeeab-aaa7-4a4a-97d8-27fb68608321/how_much_is_hp_probook_6460b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f81ff99-f891-4ae4-95e6-0afc52d3d70e/english_training_center_mexico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f75f0081-e917-4e95-a59b-6b8e4b79c6c0/zujuronibideduvaga.pdfIn PDF document text
    • http://powipuwefitori.rf.gd/great_smoky_mountains_national_park_map.pdfIn PDF document text
    • http://resibokut.epizy.com/59104751347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe5f3cb-102f-4ae6-99b3-37c19f7c26fc/vezupiwetoverowidirexeg.pdfIn PDF document text
    • http://tudixuzaw.onlinewebshop.net/56438283235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1633f4f-3f97-4bdd-8fa4-b4f1de90f845/45885407535.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_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 5272 bytes
SHA-256: 342e57041f2184ffb7c98921394858a543352bdb9f71f67480c74e3626e0be8c
font_01_sfnt_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 11184 bytes
SHA-256: 8023e3cec93af3b9e485a3f9c9148e68168aee6e3cc5d90a556d47098c5510f4

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