Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3421b0ad2ab3f68…

MALICIOUS

PDF

78.4 KB Created: 2021-02-23 13:37:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 347d2eafff73684a04c3b9476aa1a5b0 SHA-1: 5305b2e21e2150cbcb0304d43875c622bdba8164 SHA-256: a3421b0ad2ab3f685b111d71edc0654bd9521ff6fc2fa42bbbee31e59c644205
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with heuristics indicating a link farm on disposable hosting. One critical heuristic specifically flags the PDF as a malicious redirector, pointing to suspicious domains like 'crophysi.ru' and 'legionmone.xyz'. The ML classifier also strongly indicates maliciousness, aligning with the ClamAV detection of 'Pdf.Phishing.Trojan'.

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/wix?keyword=find+the+range+of+a+function+given+the+domain+worksheet In PDF document text
    • http://legionmone.xyz/samsung_un32n5300afxza_full_hd_1080p_32-inch_tvc0ufa.pdfIn PDF document text
    • https://cdn.sqhk.co/dagidomu/jgWE1hd/external_electrical_meter_box_covers.pdfIn PDF document text
    • http://seamanygau.best/sennheiser_ew100_g3_manualuvb8k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480161/normal_601d20fb7e2ab.pdfIn PDF document text
    • https://cdn.sqhk.co/wedegetuso/BihihC2/mefabozofuvufadoroto.pdfIn PDF document text
    • http://excschool.ru/rikimey4w7d.pdfIn PDF document text
    • https://jexujomasok.weebly.com/uploads/1/3/5/3/135343442/3601185.pdfIn PDF document text
    • http://xawinagolagiju.iblogger.org/imperative_worksheet_for_grade_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_602581ad21c13.pdfIn PDF document text
    • https://cdn.sqhk.co/mejomusajob/heEhcK2/37164753956.pdfIn PDF document text
    • https://cdn.sqhk.co/keserina/QUjeid1/91535983664.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://bonizeza.epizy.com/98948662661.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/acceptance_is_the_answer_chapter.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/jalusijorejemidorub.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/rocket_chat_android_client.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_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 5456 bytes
SHA-256: 0e3b3cdbb02f055a00cbc2de3503e7fc3af1ee192f4ef71902ba4ffd7b803d40
font_01_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 11188 bytes
SHA-256: 5b5e2551cea74706995e2789aa620437f99f87bc0b9e69e7a56461be94a975be
font_02_sfnt_off00011ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DED 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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