Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee3c78f3cb4a301…

MALICIOUS

PDF

86.7 KB Created: 2021-03-29 05:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bc456d45db8ff9e3754f6832c12a93b3 SHA-1: ecbcfd6b797699c30db0560565e9cf42e59aeed8 SHA-256: cee3c78f3cb4a3012f9a680ec71334a8af12b2419067f1fb65e3c86eb8f12340
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are associated with link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leading to a second-stage download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nipisod.ru/123?utm_term=baskin+robbins+ice+cream+nutrition+guide PDF link annotation
    • http://tryraisins.pro/developing_person_through_the_life_span_10th_edition_ebooksafji.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/WjhrNjh/zorunu.pdfIn PDF document text
    • http://shop-kid-toys.online/74777975801mshc6.pdfIn PDF document text
    • http://selectgetc.top/luxenanonamojoteb29xw1.pdfIn PDF document text
    • https://cdn.sqhk.co/gevopobi/vjfgfUi/mofejutawomejutinebomexa.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/MhbnHGj/14545066257.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/dNEyii3/tiktok_mashup_september_2020_30_minutes.pdfIn PDF document text
    • http://good-production9.site/states_of_matter_worksheet_grade_760siz.pdfIn PDF document text
    • http://all-casino.xyz/samsung_galaxy_s9_price_in_pakistan_second_handism3d.pdfIn PDF document text
    • http://doboliwunuzav.22web.org/smoke_detector_wiring.pdfIn PDF document text
    • http://autobuff.xyz/mevenibol7zuz.pdfIn PDF document text
    • http://esclub.info/ap_style_guide_timesm1yf1.pdfIn PDF document text
    • http://kepeligo.22web.org/what_is_the_book_the_boy_who_harnessed_the_wind_about.pdfIn PDF document text
    • http://doweryklkq.space/91519979077df5w7.pdfIn PDF document text
    • https://cdn.sqhk.co/wogirujut/afKiajb/gemelokosasagowaguji.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
    • https://7031c68c-cf47-488c-b9bd-b344696616f5.filesusr.com/ugd/51e9e9_e5eff287c78c430184ffffd7eab79262.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e441f90a-67be-4091-bfb8-376f197c1ea0/learning_arabic_app_store.pdfIn PDF document text
    • http://laxunuwozen.epizy.com/92276179560.pdfIn PDF document text
    • http://fapedixu.epizy.com/fan-tastic_vent_7350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/288f87f7-f79f-4850-b261-049dcee687ef/dewalt_dw745_zero_clearance_insert_uk.pdfIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_8a3c85226c8047de914a8f016af23055.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0527ac4e-263b-4e76-99e2-9d134c52b1c2/gimezavuvojuf.pdfIn PDF document text
    • http://sufutogikid.rf.gd/manoto.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3D 5364 bytes
SHA-256: bdb8149a9852915c6d857a829d5a9a44bdcd28d1acd3d95d321204363e182821
font_01_sfnt_off00010e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4A 2052 bytes
SHA-256: 953da2a52d47a7511df70ac9e2bfa27c9b2c9c83997a120c944c1cdce221ad8c
font_02_sfnt_off000116fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 11572 bytes
SHA-256: 63ec50bea89d203dadf6e436e38c173ab2b606b9d5ffa26a9bfcf636ad707455
font_03_sfnt_off00013e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378