Malicious PDF — malware analysis report

Static analysis result for SHA-256 234a24a770d29506…

MALICIOUS

PDF

74.5 KB Created: 2021-02-24 13:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 163d562866b801aeaaa653fc3b20ea6e SHA-1: 3f60ad7b87804009682fb7057e3a040afa9fecf7 SHA-256: 234a24a770d2950614402b0170187c1b8de155513e12dd33883285d6f4b33b93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document utilizes a link farm strategy with multiple disposable hosts, including Weebly and S3 buckets, to obscure the ultimate destination. One of the primary URLs, 'https://baarspo.ru/aws?utm_term=dehydrated+survival+food+recipes', suggests a lure related to survival food recipes, while another URL points to a file named 'windows_10_all_versions_iso_free.pdf', indicating a potential attempt to trick users into downloading a fake ISO file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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=dehydrated+survival+food+recipes PDF link annotation
    • https://cdn.sqhk.co/sejujona/jaVQdia/55836029041.pdfIn PDF document text
    • https://giburonolunege.weebly.com/uploads/1/3/1/4/131406036/6fc1ca5f1d1847.pdfIn PDF document text
    • http://uablog.website/48699378758q9oe8.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/123780.pdfIn PDF document text
    • https://kevafesituwa.weebly.com/uploads/1/3/4/0/134040773/6268958.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/cVAgizu/xuvekanojugubax.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/fc9jgaf/79466341299.pdfIn PDF document text
    • http://filanion.online/xiremg8ujv.pdfIn PDF document text
    • https://jirakeleda.weebly.com/uploads/1/3/5/9/135992973/8b8ec83b2b.pdfIn PDF document text
    • http://liwitavazij.iblogger.org/amadeus_booking_system_software_free.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/luborinizu/windows_10_all_versions_iso_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/63250231213.pdfIn PDF document text
    • http://muwaziri.epizy.com/beririvili.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/49576289657.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_off0000e4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A6 5404 bytes
SHA-256: cc56fd3f5ca78034553ba41e334e9e98f1c5c2a0990471254e7eaed66e3e4916
font_01_sfnt_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 10812 bytes
SHA-256: 85c8c1d8569597e948d4a78bc0bfccf0dcb902a10fd688411d8b1ab52fd20764

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