Malicious PDF — malware analysis report

Static analysis result for SHA-256 78386c2280a16cae…

MALICIOUS

PDF

95.6 KB Created: 2021-05-19 10:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e528353a8690f6a534b7049305807668 SHA-1: 220b50985e366a708d72968c673515af6eba2a98 SHA-256: 78386c2280a16cae0a418e5f3d3d6c5902a8bd69a067e39f0f3caaec4ee74bcc
164 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 PDF files hosted on services like Weebly and Amazon S3, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jottigo.ru/strik?utm_term=sims+4+december+2019+update+broken+mods PDF link annotation
    • https://jukikekiku.weebly.com/uploads/1/3/1/4/131453151/82e93a.pdfIn PDF document text
    • https://saxeguwub.weebly.com/uploads/1/3/1/4/131406831/8764776.pdfIn PDF document text
    • https://tudimase.weebly.com/uploads/1/3/5/9/135985307/tesewiduwi-vozobuf-xivikiwusesa.pdfIn PDF document text
    • http://tenegijo.iblogger.org/93453229278.pdfIn PDF document text
    • http://zoziwasikow.22web.org/insurable_and_uninsurable_risks.pdfIn PDF document text
    • https://duruzamuxe.weebly.com/uploads/1/3/2/3/132302842/6dbf2.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/2375381.pdfIn PDF document text
    • https://zozabamefopofa.weebly.com/uploads/1/3/4/2/134234868/mamel_tejovo_rezuvidavugop.pdfIn PDF document text
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/8857921.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/fofeguj/21487945851.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/dalum.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/bedegejuwuwegimuse.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/makenosini.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/xagijemekinurifikok.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/bukobudixekuzigug.pdfIn PDF document text
    • http://jifaradazuzigo.rf.gd/convert_coreldraw_file_to_online.pdfIn PDF document text
    • http://wedizakur.epizy.com/818787079.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/73770849578.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/elmore_leonard_fire_in_the_hole.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/73664217912.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/merexedevujavuwa.pdfIn PDF document text
    • http://tugoxejemikoze.epizy.com/serijirewiz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0D 6064 bytes
SHA-256: a855f114b85d151817263a8203cce26e4c6d74ab9a64f44549d1f21c75c2f4b8
font_01_sfnt_off0001408f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408F 1972 bytes
SHA-256: 26ae24f394867a791d59a0a3ebc33b0cfa5a016a42274c11370237b10bc4f323
font_02_sfnt_off00014a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A05 11224 bytes
SHA-256: b706f3092cc0da1150fa04d4a3372c5a1eefb4b564e5e32e8117a948dd7c358f

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