Malicious PDF — malware analysis report

Static analysis result for SHA-256 8474f2e43920a4c0…

MALICIOUS

PDF

68.8 KB Created: 2021-03-30 01:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 26b9839880a2f7b7ae85bb2f4ce1c50e SHA-1: de919b87807d44881f52f02092e03d3687965304 SHA-256: 8474f2e43920a4c09a5022caf2e31bff1bb2e97a73f1cc0fff1a730b990422dd
126 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains multiple embedded URLs pointing to external websites, with at least one identified as part of a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of external links suggests an attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://zajinet.ru/award?keyword=arvind+gupta+toys+from+trash+pdf PDF link annotation
    • http://jurogiriwizezaw.22web.org/pirates_of_the_caribbean_easy_piano_sheet_music.pdfIn PDF document text
    • http://mini-camera-super.club/can_a_thin_blue_line_be_positived40mi.pdfIn PDF document text
    • http://perfectiona.online/933789619140db6q.pdfIn PDF document text
    • http://vojidovalo.iblogger.org/zilunirazefiregap.pdfIn PDF document text
    • http://parralax.net/kabiruxedegavubadjt3kw.pdfIn PDF document text
    • http://mivegik.mygamesonline.org/90615274552.pdfIn PDF document text
    • http://nusixogej.iblogger.org/zabovefedagelogowo.pdfIn PDF document text
    • http://tixshopclub.fun/medobifiutowo.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/4ef1d6e6-6f0d-4857-b6c0-b463ac379dcc/what_are_the_indoor_recreational_activity.pdfIn PDF document text
    • http://soxupagab.epizy.com/rigeduzebaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45b9882e-7de2-430e-85b2-4c4c61ad39f5/munavezalajefifodobiv.pdfIn PDF document text
    • http://wirileso.epizy.com/b_pharm_syllabus.pdfIn PDF document text
    • http://bilitejevi.rf.gd/introduction_to_financial_accounting_multiple_choice_questions_and_answers.pdfIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_560a58f3f31d45479d42b8c741e331bb.pdf?index=trueIn PDF document text
    • http://vunonam.atwebpages.com/biological_science_free.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_68dcc30f325d4b7f8cc7f05e38d1cf9e.pdf?index=trueIn PDF document text
    • http://mowigefugitixa.epizy.com/texas_gulf_coast_fishing_report.pdfIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_90a61b525e084e40a70b37f7783bdf9a.pdf?index=trueIn PDF document text
    • http://supijidexigoba.epizy.com/nifopuresizujulerip.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_off0000d125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD125 5572 bytes
SHA-256: 47935d087ffd36932fd82754f3edb09282321b6f1d5fff3aead4ea8db0879079
font_01_sfnt_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 10144 bytes
SHA-256: da9348c4c4f02a0cf9e2ce0179e06d209058b7ee0efc28954d8c9024ae0a3867

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