Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1b7ec02de14342…

MALICIOUS

PDF

78.3 KB Created: 2021-04-18 18:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 241e42aac652393e1bb21cc04f7d245a SHA-1: 6a3ac48f1e902e5e67eabe7ebf4ad723d2e28259 SHA-256: cd1b7ec02de14342299f513fdedb77e472305a387028fc7f1bef728e237a035f
224 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The embedded links, such as 'https://yafferge.ru/strik?utm_term=i+am+who+i+am+exodus+meaning', strongly suggest a phishing or scam attempt designed to redirect users to harmful sites. No scripts were extracted, but the presence of numerous embedded URLs indicates a primary function of directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://yafferge.ru/strik?utm_term=i+am+who+i+am+exodus+meaning In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_604ef4c58b427.pdfIn PDF document text
    • http://geekcods.com/how_to_say_your_feedback_is_greatly_appreciatedf5stv.pdfIn PDF document text
    • http://ratixopawem.mypressonline.com/18439655914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402745/normal_5fe6e33772a7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_6035fba719266.pdfIn PDF document text
    • http://oneitshop.info/how_to_connect_network_using_cmdsmcjz.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/27489338257t0p58.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4455894/normal_6033b882e4cc9.pdfIn PDF document text
    • http://am-sound.ru/printable_math_word_wall_cards24bpn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452853/normal_6060edc7ba94d.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/f69bf272-52e6-45b7-847a-b472620b364a/91696946043.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/harry_potter_book_1_audiobook_free.pdfIn PDF document text
    • http://xiwexuxe.atwebpages.com/wunidemesetajevima.pdfIn PDF document text
    • http://xekubizifakum.epizy.com/91334478875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b6a1e64-d3d4-4fe2-9c0a-4a89bbdccca2/dewalt_3400_psi_pressure_washer_unloader_valve_adjustment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/503c3c2e-f51f-4464-873a-4166f6f4f5a2/34826076148.pdfIn PDF document text
    • http://sufutogikid.rf.gd/jumejosalebinokuxisof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11aa1125-a2b3-4b4f-beb9-74be27fa3362/smart_watch_phone_u8_bluetooth_manual.pdfIn PDF document text
    • http://degodev.rf.gd/blackberry_classic_battery_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/537e3b68-0515-4911-b80d-f70dde5fb112/gobegosi.pdfIn macro / runtime command snippet
    • http://bolunivagoxel.epizy.com/how_to_find_your_amc_8_score.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a6c4c0-89ba-4429-b58c-e9b62caed35b/what_are_the_different_topics_in_civil_engineering.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://degodev.rf.gd/blackberry_classic_batteryIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 5208 bytes
SHA-256: 4e2bbcca14a5260207b4a0e82360d90b9240d71a6d0a023a36feebb61f2b487f
font_01_sfnt_off00010339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10339 11880 bytes
SHA-256: e6d400b6d92e2f3b5a131b4150c1539f30beaca791d8e3da6f91217265bb1478