Malicious PDF — malware analysis report

Static analysis result for SHA-256 9022ccbbaf0278d2…

MALICIOUS

PDF

79.8 KB Created: 2021-05-12 22:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c9d5b55ea0ab8e6075fa30665a2df0b2 SHA-1: cf6b13012cd98991afc745fd0c2fec0fa91fd350 SHA-256: 9022ccbbaf0278d268c58d1fdb4e7ab98b8d17b586150462bca2a024bc029e52
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm, which is a common technique for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded links likely lead to malicious websites or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=spring+mvc+tutorial+java+config PDF link annotation
    • https://nagipabusodeza.weebly.com/uploads/1/3/1/4/131453106/dunojubizinimexok.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/59b5b3ce92b40a.pdfIn PDF document text
    • https://tufamivobanode.weebly.com/uploads/1/3/0/8/130814219/59478ef.pdfIn PDF document text
    • https://vazigawexike.weebly.com/uploads/1/3/1/6/131606690/77ae86b603ce5dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382961/normal_60086fa8cabbd.pdfIn PDF document text
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/kupepobenizap_mamadik.pdfIn PDF document text
    • http://wugafis.66ghz.com/84245302830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501996/normal_606cc7056a4a7.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/GhfzVSp/xikufubid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426679/normal_5fdf9e77820f6.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/hcLsqgi/the_looper_trio.pdfIn PDF document text
    • http://fenogavalos.iblogger.org/definition_of_literature_by_scholars.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/uhaPgjX/fire_alarm_testing_report_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_5fd6d25d34ca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464319/normal_602ad3fbc66c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuzegemed.rf.gd/54072285551.pdfIn PDF document text
    • http://dodadaxijer.epizy.com/why_is_my_motorcycle_carb_leaking_gas.pdfIn PDF document text
    • http://mevabifutaxepag.epizy.com/the_tempest_download.pdfIn PDF document text
    • http://sobovag.rf.gd/jipunewenejabufezaj.pdfIn PDF document text
    • http://reditavipesef.rf.gd/passive_voice_present_and_past_simple_exercises_with_answers.pdfIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_ed8e421181a44ddbaf4dc31334bec939.pdf?index=trueIn PDF document text
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_1bc15488c98f487badeac78c9fbc6bdc.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_bc460bd08eaa4bf78672756a892485b6.pdf?index=trueIn PDF document text
    • http://legujajojozete.epizy.com/zovarivikovin.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_33ab2e29810c4c12b89b7af84c9588c7.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD914 5396 bytes
SHA-256: fa4cdb3354df7dafe2cc6bdc8fe3643dee94b26492657d4c9b1014ab90701eb5
font_01_sfnt_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 11636 bytes
SHA-256: 98dcd2e7293c89727f5eafc4161f0d39104e2cc40b85e5de0f2867ba02bc3cc3
font_03_sfnt_off00011bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEC 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7