Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d049a2d3fd8e564…

MALICIOUS

PDF

84.2 KB Created: 2021-03-06 04:39:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 674a1fd08651df8a8c699a579cdbc909 SHA-1: a132858b1bd2200e18afdd3ae1b33e3f5ebe32f8 SHA-256: 9d049a2d3fd8e564cb4e23e6ea4bf63862eb5e2198d7f13d2d9aaedf378773c4
214 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains a high number of embedded links, many pointing to redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of a link to known malicious infrastructure further supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=is+boston+market+sweet+potato+healthy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404500/normal_60238eae92a3c.pdfIn PDF document text
    • http://smotrikino.fun/super_mario_3d_world__bowsers_fury_-_nintendo_switch_release_dateld1de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_6031c185e9ad3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402246/normal_5ffdb932906bf.pdfIn PDF document text
    • http://bluebadge-support.com/cross_stitch_alphabet_patterns_for_babykam16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_d462190ff90944bcb2a9806ce33f7bae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/bangla_natok_mehjabin.pdfIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_8525500f46204f14b398b074878f6384.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xidazeze/delaware_river_fishing_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/81847674672.pdfIn PDF document text
    • http://dogivazisuj.rf.gd/what_is_the_sandwich_method_in_offering_constructive_criticism.pdfIn PDF document text
    • http://laganomezavarof.epizy.com/bribe_ullu_web_series_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/business_case_analysis_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/fiwejuxosidinopigow.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/75600209246.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/android_mvvm_recyclerview_example_github.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 5136 bytes
SHA-256: cc8624dc9e233d6b0b6d9ea100c15357b434a4ffa1ebf838def10ec7e15788eb
font_01_sfnt_off0000fcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF2 10244 bytes
SHA-256: 7b0b01d53f96dd4e32cacc36919cf5d5c349fb543d4eb8c80cdb0e15e34994ad
font_02_sfnt_off00012031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 16148 bytes
SHA-256: d612c605d101522a7b082cd092ef78b209dae850c4a5e940dd0f53fb1bc5669f
font_03_sfnt_off00013541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13541 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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