Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d83856c81398640…

MALICIOUS

PDF

117.1 KB Created: 2021-03-18 20:32:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 59a113f4ce51e83515257ebcc7744f10 SHA-1: 75b506256d84d1c952af73670dedebc2d180963f SHA-256: 7d83856c813986400eda19c29f44479bb44db241a5c0e22f57d68905a10f6258
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external URIs, with at least one pointing to a domain associated with phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a technical document, likely to trick users into visiting the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://xezojetit.ru/award?keyword=tecnica+quirurgica+de+aneurisma+de+aorta+abdominal+pdf PDF link annotation
    • http://ruwufuwetoj.mygamesonline.org/gilunikajotibiv.pdfIn PDF document text
    • http://resokipuga.getenjoyment.net/how_long_to_charge_a_power_pack.pdfIn PDF document text
    • http://fodamibokaf.66ghz.com/nadogezenus.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/hjahaLB/viwuzawupafalufup.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/95462782875.pdfIn PDF document text
    • http://dutarotanazosuv.medianewsonline.com/amines_and_amides.pdfIn PDF document text
    • http://tolumobibuseg.iblogger.org/19833440026.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/Hgihngc/fivozonokekuraxujexobuva.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/ga_drivers_ed_practice_test.pdfIn PDF document text
    • http://mubarominufu.iblogger.org/does_chick_fil_a_nutrition_include_dressing.pdfIn PDF document text
    • https://cdn.sqhk.co/suwezuzifu/qojjij0/ps4_simulation_games_free_download.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/91500062913.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_1f2091e4f0f64afe92d5e931228e995c.pdf?index=trueIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_c1cb8a38fc5a4b05860eebb7539ec967.pdf?index=trueIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_3ec11ad8e0a34040b0f76d9984d5fa80.pdf?index=trueIn PDF document text
    • http://jigisasamupor.onlinewebshop.net/vewitezusopegivakabupifo.pdfIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_189c2bb2ec2d43108aca7cb98abe47b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58d4122-9486-4cb4-976c-2a1fb14c074d/26251587129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b04f819e-0c54-451c-a51e-75e350e99045/dopemolamebajixurekalogez.pdfIn PDF document text
    • http://ruboratanon.rf.gd/systems_engineering_and_analysis_free_download.pdfIn PDF document text
    • http://fanedabomo.epizy.com/xedupagiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc6886f-b35b-45e3-9ea1-47eb84ad00c6/49138667451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58af000-6c45-46de-b201-672a06d4532f/cisco_networking_fundamentals_final_exam_answers.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_ed688cc23c1a44e19ff203c10bd21fd1.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18290 1572 bytes
SHA-256: e88443b14e86e4d13991448cb855da87db39bf6dffcfcd92cd5b657ce7a18dc3
font_01_sfnt_off00018a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A94 5692 bytes
SHA-256: c47bbd25fcaaedb5b00d710be74b1b4493f37d23f60d9513730d2752e4f55f8c
font_02_sfnt_off00019dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DCA 12848 bytes
SHA-256: 4c8064c874c5b59e19778683a3fff3875a48b68b7a978ffcea03d6b58728a289