Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff7cdd812dadbcc…

MALICIOUS

PDF

73.1 KB Created: 2021-02-24 16:21:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c0b08d7ef6906e53e83492f95dca3918 SHA-1: 444daa969678e445b54111c28cbfd3a30e2d1dda SHA-256: 1ff7cdd812dadbccbecb4d687e9a6dc876f4903f89f3118bdb2d16e31365d064
194 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external PDF files hosted on various domains, some of which appear to be disposable. The presence of a 'download button' heuristic further suggests a lure to download malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/wix?keyword=minecraft+pe+0.12.0+apk+download PDF link annotation
    • http://nerroba.info/ankhon_dekhi_720p_free2rt4u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413982/normal_601f5c364235c.pdfIn PDF document text
    • http://milanomodaitaly.site/3232951466897s8i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467038/normal_603283b0bf896.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/933780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_600bfe3dcf4e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452607/normal_5fd33414c32bd.pdfIn PDF document text
    • https://safesawugu.weebly.com/uploads/1/3/2/8/132814337/01b707.pdfIn PDF document text
    • http://fastdonwload.space/layers_of_the_sun_coloring_worksheetv8zqo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452385/normal_5fe4e08926f8f.pdfIn PDF document text
    • http://reduslimer.website/25494962280b08qe.pdfIn PDF document text
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/66304f2d2b513.pdfIn PDF document text
    • http://help-nanny.site/age_of_empire_2_hd_freew0xi5.pdfIn PDF document text
    • http://health2health.online/284424902471a815.pdfIn PDF document text
    • http://resimpub.com/10587414364x1ptf.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/nosepevozux/dagifunixoper.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/bakery_business_plan_in_ethiopia.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/97624327079.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/5809557127.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_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 5488 bytes
SHA-256: 73e547db2980d315055ab9c9b8b5e950bedb521826874da9bfc1c13c63aa17ee
font_01_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 10272 bytes
SHA-256: 9a93f74ffea04e5c367f58065bc23c408fd32cbe121dff91a086100e99f5c5e1

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