Malicious PDF — malware analysis report

Static analysis result for SHA-256 f980cb65f56dd45e…

MALICIOUS

PDF

71.5 KB Created: 2021-02-11 09:57:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a5d80d74bcbd7b40a252aa993f1fc791 SHA-1: 6665d0c43f4decaa3f1759d9c8e0bc3d401d73b1 SHA-256: f980cb65f56dd45eab85832fe49b41a2bd069ff0d6366530bfaa89003b2c8311
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, flagged as a link farm, and is identified as malicious by ML classifiers and ClamAV. The document body, though heavily obfuscated, suggests a lure related to 'sheet music'. The presence of multiple external URLs, including one pointing to 'baarspo.ru', indicates a likely phishing or malware distribution attempt, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/aws?utm_term=jealousy+tango+sheet+music PDF link annotation
    • https://cdn.sqhk.co/vorebilifi/jbdiiKG/16511726497.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/hcvjIic/color_replacement_photoshop_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/egcCjdc/45346595324.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/7377137.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/e7gihde/44177898032.pdfIn PDF document text
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/7c02df9e7d4.pdfIn PDF document text
    • https://cdn.sqhk.co/kukojuvata/jbigFZb/malifepenitulokep.pdfIn PDF document text
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/bunixizakunug.pdfIn PDF document text
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/jilimeg.pdfIn PDF document text
    • https://cdn.sqhk.co/dikozogub/igfDnJW/orange_fruit_fancy_dress_costume.pdfIn PDF document text
    • https://lonawapusar.weebly.com/uploads/1/3/0/7/130776864/1570108.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/iIggWjf/12723830424.pdfIn PDF document text
    • https://butusokusumowa.weebly.com/uploads/1/3/5/2/135294155/xibulofigapetivovot.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/hasmohi/police_scanner_5-_0_pro_apk_free_download.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/sutisoge-pokugosuko-xupipegakumit-tagugiz.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/zarevizebi/google_give_me_today_s_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/determiners_practice_worksheets_for_class_7.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/brs_training_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/bigesotuvubezirirukunog.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/77781863872.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/96477595557.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/91925625345.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/7598700228.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/85806066976.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_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 5208 bytes
SHA-256: dbda3d4a0e302569e853d83d541383afaec10abcb6f4b172117dbd36662656f6
font_01_sfnt_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 11728 bytes
SHA-256: d3d039303117bffcbd86d717e5f71bd4ecbcdb9c0a7da63e9a9f07911888665a

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