Malicious PDF — malware analysis report

Static analysis result for SHA-256 20369b9cac2b175c…

MALICIOUS

PDF

87.4 KB Created: 2021-05-19 01:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ba396ec157665dc3365c5b789b3ec9dd SHA-1: 224283271a57f1ea6c53bfe1067eaa34a9b90198 SHA-256: 20369b9cac2b175c4a1c875af5b4a0067e0122ad6971daee902179795cbe39e5
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with a primary suspicious URL being https://xezojetit.ru/strik. The PDF's structure and the presence of many links suggest it functions as a link farm, likely intended to redirect users to malicious content or phishing sites. No scripts were extracted, but the PDF's nature points towards social engineering to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/strik?utm_term=topaz+studio+2+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369504/normal_60258c12a1cf1.pdfIn PDF document text
    • https://wajuzetixageg.weebly.com/uploads/1/3/0/9/130969085/vapapu.pdfIn PDF document text
    • https://zogopovedizojux.weebly.com/uploads/1/3/1/4/131408172/8177129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_60111e94e7aa8.pdfIn PDF document text
    • https://kisimerib.weebly.com/uploads/1/3/4/6/134697331/bobaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_605cab951d23f.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/db5f477f2c851c.pdfIn PDF document text
    • http://xonibiz.22web.org/1283404853.pdfIn PDF document text
    • https://tivenudonokokom.weebly.com/uploads/1/3/0/9/130969369/1887113.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/b20d1e07-d154-45b4-9cce-ee6d6fb71b55/eclipse_mp3_player_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dd476b7-d230-4bc9-87e8-ff733d27796d/62303551936.pdfIn PDF document text
    • http://wubifut.rf.gd/chemistry_notes_for_class_12_free_download_rbse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa76292f-50df-443b-bc30-d147d8e446a5/32688371517.pdfIn PDF document text
    • http://tasefabomodewiv.epizy.com/simif.pdfIn PDF document text
    • http://xafaxeko.epizy.com/47490830690.pdfIn PDF document text
    • http://xisapedugifado.epizy.com/bruchrechnung_multiplikation_und_division_aufgaben.pdfIn PDF document text
    • http://mumizoxagoguros.rf.gd/23831660882.pdfIn PDF document text
    • http://titasukutisun.epizy.com/nuxepefofiguzinin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8409da5c-f35d-4d67-b43c-74b060a59df9/94929140029.pdfIn PDF document text
    • http://ruwozubusa.epizy.com/wizards_of_the_coast_dd_5th_edition_character_sheet.pdfIn PDF document text
    • http://xiburebejevikom.rf.gd/best_self_tanner_ulta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c4cb38d-f758-4f1f-b464-fab7ae5c9ce9/microsoft_universal_mobile_keyboard_for_ipad_iphone_android_devices_and_windows_tablets.pdfIn PDF document text
    • http://josegofubusem.epizy.com/xulusojiguxekizokediber.pdfIn PDF document text
    • http://mizozibobekujul.rf.gd/what_did_the_grand_inquisitor_mean_when_he_died.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_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 5128 bytes
SHA-256: 7785c0a70b4d6e16cf24c4ac313de4ae46d48e962f2613fa231d65d71deed051
font_01_sfnt_off000128da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DA 11588 bytes
SHA-256: 6f95c06abbe6ba8f1bab340c1e803787485a933ec87826d24f18a443d895f9a9