Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c50394558d773fc…

MALICIOUS

PDF

76.8 KB Created: 2021-03-17 23:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 020304be7afee67afc4215a9f08925ca SHA-1: dca1397cc25e262241489a7ff3a719eec234e01b SHA-256: 1c50394558d773fca1be2e8efb56459e1ee4ca11a2d4ad243f746d89fdeb67ee
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file exhibits critical heuristic firings indicating it functions as a malicious redirector and a link farm. It contains numerous embedded URLs pointing to external sites, with some specifically identified as malicious redirectors. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=monster+legends+guide In PDF document text
    • https://cdn.sqhk.co/jumupebuvi/YWol3BA/alive_in_shelter_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/votexeruwiti/jfGvRGq/digikisujojagujutujidopan.pdfIn PDF document text
    • http://podcard2020.site/wawonugubvswqc.pdfIn PDF document text
    • http://on-arenas.com/cateye_velo_8uhp4h.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/Ehebhfu/1661927247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373008/normal_5fd2702a6d4b1.pdfIn PDF document text
    • http://grafoanaliz.ru/oral_b_braun_triumph_replacement_headsb1s4p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393506/normal_5fee873df10fa.pdfIn PDF document text
    • http://noxaduva.mypressonline.com/37273960415.pdfIn PDF document text
    • https://werikaduf.weebly.com/uploads/1/3/4/4/134483952/ece5861.pdfIn PDF document text
    • https://xuwekakef.weebly.com/uploads/1/3/1/8/131856316/kagaxovemakag-vavegixajugapi.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/Pjgadje/tetefilasovokovevaxif.pdfIn PDF document text
    • https://bodonoweti.weebly.com/uploads/1/3/1/8/131856710/jatano_divugijobip.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/103463452665axag.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/92f64772779c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_5fe7d7c368b72.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/ghjb3Kg/44799599422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_602d675c35a61.pdfIn PDF document text
    • https://letunaxure.weebly.com/uploads/1/3/1/3/131383761/63e6f633e0ed.pdfIn PDF document text
    • http://aydym.club/10020120343t4z50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/ge_universal_remote_control_codes_for_toshiba_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8534d086-9ef5-4b1e-ba2b-a8364c5e9d2b/benefits_of_using_ipads_in_the_classroom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8202afe-9bfb-4a1b-b95d-a66d399835c6/nys_cdl_road_test_evaluation_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac01259-9891-4e87-9f71-dd2a5fedf1b5/64198695543.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_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 4788 bytes
SHA-256: 6f270813be87940e3393a2c8794eef5cdaa7980c475250af25c955518ca83c23
font_01_sfnt_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 11432 bytes
SHA-256: a2ebb9901b5d7341f6718eb64d341868c0c24a718fa282aa26f99fd959e88485