Malicious PDF — malware analysis report

Static analysis result for SHA-256 359b0ce685b6b314…

MALICIOUS

PDF

69.5 KB Created: 2021-01-10 02:55:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e9a054893961efb091dbacf878e7c6bf SHA-1: b0ffd4721a072bf28c83725afc8067fb9d63034f SHA-256: 359b0ce685b6b3146867bd32392655187da8841579e30d194d36af4f4e2dd76a
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged for linking to known malicious redirectors and acting as a link farm. The embedded URLs point to disposable hosting, suggesting an attempt to distribute further malicious content or engage in SEO spam. While no scripts were directly extracted, the nature of the links and the overall structure strongly indicate a phishing or malware distribution vector.

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://gettraff.ru/123?utm_term=sennheiser+rs+195 In PDF document text
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/2470aad78f.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/igjhQhj/23642287442.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/jhiayni/just_dance_controller_pairing_code.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/JohgUic/fast_cars_racing_on_highway.pdfIn PDF document text
    • https://jevogebog.weebly.com/uploads/1/3/2/3/132303093/8e3d979c.pdfIn PDF document text
    • https://site-1202138.mozfiles.com/files/1202138/docker_mac_os.pdfIn PDF document text
    • https://site-1168415.mozfiles.com/files/1168415/world_soccer_2018_crazy_games.pdfIn PDF document text
    • https://site-1175416.mozfiles.com/files/1175416/white_quarter_round_trim_lowes.pdfIn PDF document text
    • https://site-1167927.mozfiles.com/files/1167927/jemizisexipudaxufizekewo.pdfIn PDF document text
    • https://site-1173589.mozfiles.com/files/1173589/zixivexovaxafalabidujux.pdfIn PDF document text
    • https://site-1178066.mozfiles.com/files/1178066/wedding_salon_2_mod_apk_unlimited_everything.pdfIn PDF document text
    • https://cdn.sqhk.co/xewazezikufi/jbctjaH/47646356295.pdfIn PDF document text
    • https://cdn.sqhk.co/gezefesete/vjjjgic/potewevuzajipeneruvugujer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/barter_6_full_album_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/alexa_app_for_amazon_echo.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/sql_server_2012_sample_database_free.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_off0000d45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 4968 bytes
SHA-256: 65a046a3a099de97568089c322f603782629f2f5b0ee09bd14d3fffae44e1e41
font_01_sfnt_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 9952 bytes
SHA-256: b6f81b8b60e3cbdce130de43a7e1b89e81180a96adb0ebb85cb034bfd786b50d

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