Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e56d9dc315f664…

MALICIOUS

PDF

79.5 KB Created: 2021-06-10 09:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4523962ce529d8b6a42cb36fd10bc518 SHA-1: 03f1cae90f80a558c45608a9a354580318eb2d63 SHA-256: f9e56d9dc315f6645c0900eb6ac993247b39101b4e99479f97dbeb2561c6a078
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'synerhu.ru', suggesting it's used for phishing or to download further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, further supporting a malicious purpose.

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://synerhu.ru/pbw?utm_term=blest+be+the+tie+that+binds+pdf
    • https://cdn-cms.f-static.net/uploads/4499942/normal_5fdc704e1e062.pdf
    • https://static.s123-cdn-static.com/uploads/4474746/normal_5fcf4700c29c6.pdf
    • https://static.s123-cdn-static.com/uploads/4374368/normal_5fc95e2c635f7.pdf
    • https://pakipuxis.weebly.com/uploads/1/3/5/3/135347710/fofekavegen-mofuzexizijexa-durowuwexefo.pdf
    • https://xofezariro.weebly.com/uploads/1/3/1/8/131871505/kifinaxix.pdf
    • https://rirejanumaxix.weebly.com/uploads/1/3/4/6/134631236/802841.pdf
    • https://cdn-cms.f-static.net/uploads/4366666/normal_604f99762f725.pdf
    • https://movibudepusoxof.weebly.com/uploads/1/3/4/6/134636867/folevazi_tegepasi_wovatifokegi_momevusal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bekivuxuga.pbworks.com/f/vewovoxuzadel.pdf
    • http://bupataved.pbworks.com/f/free_gem_generator_for_clash_of_clans_no_survey.pdf
    • http://vadibun.pbworks.com/w/file/fetch/144709806/mavulazagatem.pdf
    • http://biduzoku.pbworks.com/w/file/fetch/144456051/css_web_design_for_dummies.pdf
    • https://uploads.strikinglycdn.com/files/8974b7bf-0ce9-44a6-8769-6764764f644f/pubewefinabudefob.pdf
    • http://pulixojesu.pbworks.com/f/aimbot_free_fire_ios.pdf
    • https://uploads.strikinglycdn.com/files/9603b824-02e6-4c35-a7f0-8492a5120422/zaveji.pdf
    • https://uploads.strikinglycdn.com/files/56b58704-03b1-47f3-9021-c60b5232fab3/robinair_34788ni_customer_service.pdf
    • https://uploads.strikinglycdn.com/files/2dc2cfc1-5174-4bd6-9186-b7a2570f6eef/fojaxevatofetedi.pdf
    • https://uploads.strikinglycdn.com/files/67287564-d7f7-4873-8c2a-d1e3c754b3a3/where_to_start_losing_weight_when_obese.pdf
    • http://motekus.pbworks.com/f/tenawukelaj.pdf
    • http://vogituvu.pbworks.com/f/51967680964.pdf
    • http://xujefix.pbworks.com/f/xubuku.pdf
    • http://kelivesas.pbworks.com/w/file/fetch/144475785/vazusipowusodo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8a.bin
a16cea783819a2b827fd6d142299e4bc16b388eaffab828e4f07fa5c7d178df2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 4900 bytes
font_01_sfnt_off0000fb1c.bin
07ea467f0c36417218fd3d24323c07a0e9f54227b7e9391bea6b00bfcfbb938e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 11532 bytes
font_02_sfnt_off00012276.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 4324 bytes

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