Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c76635cae588eb7…

MALICIOUS

PDF

78.5 KB Created: 2021-02-21 08:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2c8ea3e207406aec257f3d57ad08de08 SHA-1: 172305a019ba5b851658136e6d0fd85f0335a287 SHA-256: 0c76635cae588eb7417a6cab22b5d72644b0a2bf695d743995bd197e1e60a393
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a large link farm. The embedded URLs suggest an attempt to either phish users or engage in SEO manipulation. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the presence of numerous external links indicates a potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://crophysi.ru/123?utm_term=prefix+suffix+and+root+word+worksheets+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4454559/normal_5ff6713783fb0.pdfIn PDF document text
    • http://gayerkan.com/3864625096i9lo8.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/d1NmVjd/painting_job_estimator_app.pdfIn PDF document text
    • http://muxonobugimaki.22web.org/80797586186.pdfIn PDF document text
    • http://rabejagoruwobol.66ghz.com/manualidades_con_papel_arco_iris.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/FlMhOie/hd_mobile_movies_free_download_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/peporewav/0m2RDOD/guposixeku.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/giidjjn/mowowidigibo.pdfIn PDF document text
    • http://daliadiago.com/primary_mathematics_3a_workbookfa96p.pdfIn PDF document text
    • https://cdn.sqhk.co/mozejipakas/jgAhjpF/tesavegiretuxopole.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/irhcZha/pekutinidageru.pdfIn PDF document text
    • https://belikonanobos.weebly.com/uploads/1/3/4/6/134610264/kusarax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424981/normal_5fd17eb4b4306.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/prPiggi/46306516461.pdfIn PDF document text
    • https://warenumew.weebly.com/uploads/1/3/4/8/134871813/6d24d08e16d.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/yHgMhja/sportsmax_app_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tujuvemevo/5F2jaRO/rival_stars_basketball_best_players.pdfIn PDF document text
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/d1dd0.pdfIn PDF document text
    • http://parhelifrl.space/gratis_panda_cloud_antivirus_en5ub06.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://kefujaforu.rf.gd/cdfm_exam_study_guide.pdfIn PDF document text
    • http://bedekopezedegej.rf.gd/chipettes_happy_birthday_video.pdfIn PDF document text
    • http://kanusilos.epizy.com/manually_operated_sheet_metal_bending_machine.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 5204 bytes
SHA-256: a3192b69f5c7cd0ac9dc91ea8c55bf8c4c81856192b5d43f808c292083a15a14
font_01_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 10476 bytes
SHA-256: 4c00ae6302cb0bc121ec4ffa4b6e167cad3ae1f9866f246824b8ac05344210ef
font_02_sfnt_off00011e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E05 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176