Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be5c838b59ecca4…

MALICIOUS

PDF

82.0 KB Created: 2021-04-25 16:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b58810deac78c3b891283abab82f5a48 SHA-1: 03ea85c4030c087fcaa0ee3e561282cf6c6e2718 SHA-256: 3be5c838b59ecca4c8515848f4d9b5c127f0cd68ea8ff588e2b46427cd51a439
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly benign ones. The primary malicious URL identified is https://jottigo.ru/strik, which likely serves as a redirector to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/strik?utm_term=can+i+drink+apple+cider+vinegar+with+tea PDF link annotation
    • http://realnoe-obshenie.online/tezismtabf.pdfIn PDF document text
    • http://wirelessinfo.ru/16601796661ukiv7.pdfIn PDF document text
    • http://mugukix.mygamesonline.org/american_english_file_3_workbook_answer_key_second_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/ese6wj8/29755640306.pdfIn PDF document text
    • http://1cats.space/sevevuxulewimv2dv.pdfIn PDF document text
    • http://khanapoorti.com/9867637163e9vut.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/tbjegix/66703136604.pdfIn PDF document text
    • http://m-ryanaf.site/zoruzakazazuxalaribubio6v94.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/5ed8991a-9098-4e14-a079-e11ae00d4efc/how_much_is_a_can_am_xmr_1000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72084000-7d8d-4ebc-a8b3-aad07bee2783/31262647087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9894209-4e6c-4323-8f58-09f3ac6446c3/what_is_manual_dexterity_good_for.pdfIn PDF document text
    • http://sifirajudexotiz.epizy.com/5308354502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/197fc742-8fcc-4cdd-a269-47c9ceb939bd/waregiso.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/fuvisazuravewupir.pdfIn PDF document text
    • http://xegiwofune.rf.gd/doctor_who_classic_series_episode_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81ddb67-23de-46d7-bc6b-d0a91c3109ab/loletolino.pdfIn PDF document text
    • http://jafixomedimun.onlinewebshop.net/86243885456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7875d7a-f191-40d5-b07f-c0483f144d97/bozosuwedidovabine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4cd027d-edfb-40a6-a834-0a2d0db5f244/godozukegif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fd03ee7-336a-4c6e-9fcf-09ee8a845389/80909087300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f105278-08b3-40e2-8816-a930e96a09b7/how_to_repair_washing_machine_dryer.pdfIn PDF document text
    • http://puvapulugo.onlinewebshop.net/18754728379.pdfIn PDF document text
    • http://wopepib.epizy.com/sujax.pdfIn PDF document text
    • http://tozuduxaxikagik.rf.gd/to_verify_bernoulli_s_theorem.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_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 5280 bytes
SHA-256: 46a37d39c5fba7d2ef4bca415eaecb470260bb9d0e725f5b9eb681874bae9aee
font_01_sfnt_off000114b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B0 11088 bytes
SHA-256: e9e197aef3090ef91fa89f2a98e871621ec73f490e60de8439780226c9e21500

Open this report in the interactive analyzer, or submit your own file for analysis.