Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bb65b8736f9132…

MALICIOUS

PDF

79.2 KB Created: 2021-02-13 01:26:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 349c655176b55a16ed94c72ac5280453 SHA-1: da748b0d4b0a5877ef36079d05cde2e91484d1e3 SHA-256: 20bb65b8736f91329a8ecb5ef033f734c0d87ba74e0b6808df4e9a01faf04793
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links designed to redirect users to malicious websites, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to research methodology, aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=que+es+cualitativa+y+cuantitativa+en+una+investigacion In PDF document text
    • http://werenntaq.online/mujalutajojegumitodoguwi4df1p.pdfIn PDF document text
    • http://vorecan.space/pelixopunokurizegexq622.pdfIn PDF document text
    • https://wudatoguji.weebly.com/uploads/1/3/4/8/134885495/zinusajogiwit-verugeloxubew.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/ifiejhg/shogun_2_guide_shimazu.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/3jdjilX/my_arcade_pac_man_pocket_player_hack.pdfIn PDF document text
    • http://palipupo.22web.org/51145806357.pdfIn PDF document text
    • http://pubgmobiie.com/nawobapajenosiruzajixo7wzhm.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/giU2hfe/highwaymen_mc_ohio.pdfIn PDF document text
    • https://gopopozemilin.weebly.com/uploads/1/3/0/8/130874381/cc375381ec8486.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/solaxasavawomuf.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/esjblgj/is_there_a_google_hangouts_app_for_mac.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/leteraxewe/sekufapiverub.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/bulletproof_diet_alcohol.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/lugixagebozixafof.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/tesugupasojowurimenubilof.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/47766068246.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/55255710895.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/vascular_malformation_after_surgery.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/fagakinetefenudijimedunuw.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_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 5092 bytes
SHA-256: e7651b353de9acc08131b2688c1cfa6bbb29ee9e0976d1466a0d3e599f70de4f
font_01_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 11580 bytes
SHA-256: 9a4952255c79e5ccc704bc256afcc2a5efcc8e87f08af35e5b73737aacc6d58c

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