Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74bdf9950138841…

MALICIOUS

PDF

74.3 KB Created: 2021-02-19 00:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ba66dbdbee0f0dee182b74efb22e3845 SHA-1: 727fcbc2e70f5ec75324ad0d323d54c85dd0b965 SHA-256: a74bdf99501388418fbed9370fbab52b10336075ef3139932c5c61cfe8ad2636
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on various disposable domains, indicative of a link farm. One of the embedded URLs, 'https://crophysi.ru/123?utm_term=how+to+put+radio+code+in+honda+civic+2006', is flagged as malicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=how+to+put+radio+code+in+honda+civic+2006 In PDF document text
    • https://dopakujovifoba.weebly.com/uploads/1/3/0/7/130739833/retanudirinox.pdfIn PDF document text
    • https://bizotimugir.weebly.com/uploads/1/3/1/1/131164076/luxelu_mijavuloxodojed.pdfIn PDF document text
    • http://manaxupupili.iblogger.org/memes_stickers_para_whatsapp_apk.pdfIn PDF document text
    • http://negowupo.iblogger.org/bt_wifi_app_android.pdfIn PDF document text
    • https://cdn.sqhk.co/zabitokepum/zggo3r5/danger_dash_run_java_game.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/jjiesX2/moto_gp_racing_games_download.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/0479e.pdfIn PDF document text
    • https://raguwagoneneza.weebly.com/uploads/1/3/1/3/131384547/pawakini.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/9481983.pdfIn PDF document text
    • https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/bonalegilirozujako.pdfIn PDF document text
    • https://xigokujote.weebly.com/uploads/1/3/4/6/134649591/54e81.pdfIn PDF document text
    • http://kejamezegujoz.iblogger.org/microsoft_windows_7_bluetooth_software.pdfIn PDF document text
    • https://wuzizado.weebly.com/uploads/1/3/5/4/135401221/labifeti.pdfIn PDF document text
    • https://pejagefetem.weebly.com/uploads/1/3/0/8/130815482/ecf3b07ea4d6e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toxalotivip.epizy.com/suzirugatinunovisisuw.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_off0000e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61C 5492 bytes
SHA-256: 95c21a111c86e364429abf6c6e61919095e24e99e020f67f62b3c75a011acaa6
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 10328 bytes
SHA-256: 32d5d09d4431bd7273a4feda458049a6186b76e0916ce18cf4a49fdd945dc482

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