Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31ca85583c62f33…

MALICIOUS

PDF

80.0 KB Created: 2021-03-18 13:00:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c0928893d81c150a6ec0ac5f47ef4bc8 SHA-1: 98de8dbcd6394ed83251126ce0d99e071e7f68a0 SHA-256: f31ca85583c62f337b6ea279529fbb0dc3f5d4ec265a0fbef44a3fb7bcbe43f7
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/strik?utm_term=lg+oled+refresh+rate+settings PDF link annotation
    • http://idslim-italia.site/348592939507jqn8.pdfIn PDF document text
    • https://fepuvagugi.weebly.com/uploads/1/3/4/7/134767339/1aabbdc3d.pdfIn PDF document text
    • http://wowitaly.space/how_to_format_discord_texteiya6.pdfIn PDF document text
    • http://shoplus.info/35314657301u8ilg.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/ficij4w/xc_mountain_bike_racing_categories.pdfIn PDF document text
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/zezimarofoza.pdfIn PDF document text
    • https://kawotubizon.weebly.com/uploads/1/3/1/8/131871780/1340459.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/ghehaO1/hocus_pocus_cast_2_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/guzamuvi/jeihIhi/color_harmony_generator_adobe.pdfIn PDF document text
    • https://vusokozederik.weebly.com/uploads/1/3/4/9/134901716/4820e1.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/YU8iahb/block_tank_wars_unlimited_money.pdfIn PDF document text
    • http://confirmationhelpcenter.com/gebufavatanoxebs2s21.pdfIn PDF document text
    • https://gidelusibi.weebly.com/uploads/1/3/4/0/134040719/xalamegedokux_lugel_tevomurix_vebuzalip.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/cdhizFz/51884665659.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/vukusa/omnibus_budget_reconciliation_act_of_1987_nursing_home_reform.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/bufufojazijibadis.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/85430824219.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/wufetonifogisiv.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_f4c752b63468478b87a764e2c31669f1.pdf?index=trueIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_96aa808803f640babe95da278ca7d716.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebisop/78712532057.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_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 5112 bytes
SHA-256: 158142f7d2ed057fddfd118749f43d83c946a95c4a231e5d4ef679fea3296f16
font_01_sfnt_off00010d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D55 10816 bytes
SHA-256: 72570f9ab8ceec866f672b7b6defcf70feffdaa7664e82b16a9edc2e90a6c83f

Open this report in the interactive analyzer, or submit your own file for analysis.