Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6e1823501a6473…

MALICIOUS

PDF

80.5 KB Created: 2021-03-01 07:23:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6934927f9319c2c4fd25a13a25822c6a SHA-1: ebe8eb13590f7bd991393e8272c506367621e773 SHA-256: bd6e1823501a64733806321fed0d0b38f7b7351e371dd50c195c90e26d1e067d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/123?utm_term=ged+science+practice+test+free+printable PDF link annotation
    • http://xejopegig.mypressonline.com/10873409599.pdfIn PDF document text
    • http://probnik1313.tech/1106393140ogo56.pdfIn PDF document text
    • http://cleaner360.shop/55062248862ecgxb.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/2122686.pdfIn PDF document text
    • https://devonejejarib.weebly.com/uploads/1/3/4/6/134608322/8164544.pdfIn PDF document text
    • http://wamipivifubape.sportsontheweb.net/78714811344.pdfIn PDF document text
    • https://guvoruba.weebly.com/uploads/1/3/4/7/134742814/f0f10621b0e424.pdfIn PDF document text
    • http://carinsrates.com/proform_345s_crosswalk_treadmill_wonyww5c.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/neviwove/locum_tenens_crna_salary_report.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/pejitefuropafudi.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/bahubali_2_tamil_movie_isaimini.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/freddie_mac_guidelines_regarding_student_loans.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/72023095944.pdfIn PDF document text
    • http://pesetunal.onlinewebshop.net/guy_who_invented_pet_rock.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/traffic_report_101_freeway_santa_barbara.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/makewofimevoxox.pdfIn PDF document text
    • http://adult-education.suite101.comIn 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_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 5320 bytes
SHA-256: a04e9ff836e586869fb53314daf9e0eff92a763c971069483b5f7d2455314c76
font_01_sfnt_off00010d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 11652 bytes
SHA-256: 5df75a154eb7dc4e56813f38cc0a1f335c30f1efdc8fb792c65de8b3b5b3917d

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