Malicious PDF — malware analysis report

Static analysis result for SHA-256 106bc38208fbfa15…

MALICIOUS

PDF

74.8 KB Created: 2021-03-27 17:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 023b0d50254f1aef57a36a32e83c07c7 SHA-1: 0a1ba9aef45f99f3bb6a27c2c683cf90e723280c SHA-256: 106bc38208fbfa15b87a2b7ae058d263e133f6da21b23085041c62d48da27aca
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are flagged as malicious or part of a link farm. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to 'yafferge.ru' as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a city plan, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/award?keyword=bydgoszcz+plan+miasta+pdf In PDF document text
    • https://kerozuvesiduzam.weebly.com/uploads/1/3/4/3/134375161/7344dadb3ec3.pdfIn PDF document text
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/3116868.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/seboto_melidevibififun_rebivoje.pdfIn PDF document text
    • http://sozaxasofurem.22web.org/dexenidakowiwujasogiwe.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/34e5e.pdfIn PDF document text
    • https://gapurosudezejug.weebly.com/uploads/1/3/5/9/135965954/6917107.pdfIn PDF document text
    • http://siluduto.22web.org/unlimited_power_of_attorney_sample_format.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luzadewo.epizy.com/14912437619.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/polepuwoso.pdfIn PDF document text
    • http://waxaravibew.epizy.com/nuganosazis.pdfIn PDF document text
    • http://mikugux.rf.gd/zezesugi.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/classical_ukulele_tabs.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/electronics_mini_project_report.pdfIn PDF document text
    • http://favukimasinete.rf.gd/garmin_vivofit_3_watch_strap.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/lobobeworuvolisat.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/puzzles_and_dragons_evolution_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/72032525134.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/epo_guidelines_adapted_to.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/17113492263.pdfIn PDF document text
    • http://pufosibixoge.rf.gd/w-_4_form_withholding_table.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/94898100694.pdfIn PDF document text
    • http://lupewozer.rf.gd/nikibemipetizikum.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/gemubalotenewaboxil.pdfIn PDF document text
    • http://ratotepuno.rf.gd/55267191028.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_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 5580 bytes
SHA-256: 4e504750b97947735bde03419f1291edd1ca98a12bc46cf39f6d68435c3da8e5
font_01_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 12024 bytes
SHA-256: fce712ec0d3c5ec8a9251615f7ee9d56804fbff189feb68019596f7da26234fd

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