Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8eb2ca0353170a5…

MALICIOUS

PDF

75.6 KB Created: 2021-02-17 07:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9ba2259a6d42f7074aa896c342d7d741 SHA-1: 9ef8c0711aaac75a643ee48822b8d60a74bc1a78 SHA-256: a8eb2ca0353170a520fcf83eac7bf08c25a7eedae159aed39c51ef55fbe7b50b
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a phishing or content-luring attack pattern, likely delivered as a spearphishing attachment.

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://seumenha.ru/123?utm_term=2013+bmw+x3+repair+costs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417653/normal_5fe26d1c0a411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_602212f9c30c5.pdfIn PDF document text
    • http://cancandance.org/assetto_corsa_f1_2019_freevxqa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_6018c6816b7bb.pdfIn PDF document text
    • http://domainlimax.xyz/macros_excel_spreadsheettlns8.pdfIn PDF document text
    • http://s7hmus.org/biblia_romanaj355e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471250/normal_5fed60db18642.pdfIn PDF document text
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/kapewulun_xekomavikek_vizoveb_reruxobup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412774/normal_600043108897d.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/zufaxepixiguxax/42600867949.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/kudibekogobopugefaperivov.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/73676698530.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/krispy_kreme_oreo_cookies_and_kreme_doughnut_nutrition_facts.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/spongebob_scientific_method_worksheet_answers_flower_power.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_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 5744 bytes
SHA-256: b3f37af38ba78836727d905bc2e58fd9ca38d314896e4662d4864fabcb7abe75
font_01_sfnt_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 11324 bytes
SHA-256: 71b934f62c3ae1c715d8e252f55f0822898140b568b609ce91ef1e88157e33d9

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