Malicious PDF — malware analysis report

Static analysis result for SHA-256 9597ea4288713219…

MALICIOUS

PDF

93.4 KB Created: 2021-03-19 06:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 337da26536f892b31bc46f1ddd60bf08 SHA-1: 891f539a936159366e730a7c968fbc2b36dd4831 SHA-256: 9597ea4288713219fdd57e6ef78a8dec3b402bab668b03ef4c97581c334158b4
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting and contains external URIs. The primary malicious URL, 'https://soxebez.ru/award?keyword=difference+between+grief+and+bereavement+pdf', is embedded within the document, suggesting a phishing or malware delivery attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/award?keyword=difference+between+grief+and+bereavement+pdf PDF link annotation
    • https://cdn.sqhk.co/solalokazili/diftF2t/47686449878.pdfIn PDF document text
    • http://tejowigasinafu.getenjoyment.net/how_to_develop_listening_skills_in_a_child.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/pegufodotokuxenojor.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/oxford_english_to_bengali_dictionary_download.pdfIn PDF document text
    • http://arenaprobet.com/kowibexatozibumeramxvpcq.pdfIn PDF document text
    • https://cdn.sqhk.co/tizesefetus/gicia8s/49742184347.pdfIn PDF document text
    • http://kulinar2020.site/mopifowikuzapesezhfume.pdfIn PDF document text
    • http://mikazuxo.mypressonline.com/ie_irodov_kinematics_questions.pdfIn PDF document text
    • http://internet-babki.ru/97624796367uevtm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pupuwejerew.epizy.com/dafoxidedelopexepakesuvu.pdfIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_4fa2f000811e4484ba900062b8120d77.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_92e068aea0eb40409c32f5b8012dcd2c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b81f0a6-ddfc-45c6-9a6f-fc0637b6a8af/how_much_does_a_2.5_ton_trane_ac_unit_cost.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_3fa9c42db44442238ba76a020b085a0f.pdf?index=trueIn PDF document text
    • http://puriwevusireda.rf.gd/thomas_calculus_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3669408-8d45-4da5-94c9-3a7f914363a6/84150027767.pdfIn PDF document text
    • http://bopobirogugosef.epizy.com/what_are_the_4_essential_components_of_natural_selection.pdfIn PDF document text
    • http://bosagiriwamokin.onlinewebshop.net/gukotuvez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c590d172-953b-4e5b-9a64-d168a71ed0bb/70182595731.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_1216f04ebdb7416d8484547b6efc83f9.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_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 5236 bytes
SHA-256: 374ab9c001413672b8ffe1723c2434b3980d731e2718fea9f273eeb63eeb84fe
font_01_sfnt_off000132e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E8 10940 bytes
SHA-256: 68be4a1d0e71941eacf2765a4bce3c1dece050c67ce8d86115c1b24526d115bc
font_02_sfnt_off00015857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15857 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333