Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f55fb77927dc14f…

MALICIOUS

PDF

70.0 KB Created: 2021-02-21 21:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f9d23320baac46a5fbebdae8ba0f3d26 SHA-1: ad46c03afca9af7c06bae67ae9d81051dfc28241 SHA-256: 0f55fb77927dc14f4d88005c15faa7db04b34eae16044c18f1881c0ffbcb18ae
244 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its extensive use of link farms hosted on disposable domains, designed to redirect users to malicious infrastructure. The document body, while appearing as a search query, is a lure to disguise the malicious intent of the embedded links. The presence of numerous PDF links and redirection to known malicious infrastructure strongly suggests a phishing or malware distribution campaign.

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.
  • 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.
  • 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/strik?utm_term=how+do+you+reset+the+code+on+overhead+door+legacy In PDF document text
    • http://qunit.space/is_the_assassins_blade_a_prequel93bus.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/gjijehh/panukusepitevunajebubituw.pdfIn PDF document text
    • https://dofabogadu.weebly.com/uploads/1/3/0/7/130739956/3e436b8b27fc34.pdfIn PDF document text
    • https://bupefozatige.weebly.com/uploads/1/3/4/3/134384552/b31d1e35.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/AgegjsZ/streamlabs_prime_free_shirt.pdfIn PDF document text
    • https://cdn.sqhk.co/xogodapap/WGhghgh/tagutodedafukuwamamo.pdfIn PDF document text
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/5732517.pdfIn PDF document text
    • https://cdn.sqhk.co/mewoveri/eLG6jj1/jewazoluvuganome.pdfIn PDF document text
    • http://ygrash.website/hollywood_screenwriting_directory_20zc3fo.pdfIn PDF document text
    • http://rocketdocs.us/ridotugexenofoxazomusajag8fhdp.pdfIn PDF document text
    • http://workbykoder.xyz/productos_de_la_segunda_sesion_del_cmk7e3.pdfIn PDF document text
    • http://fortuneo-enligne.com/successful_writing_at_work_concise_4th_edition6vki1.pdfIn PDF document text
    • https://cdn.sqhk.co/sikereri/HyEUjf4/zafuvigeduxaziroti.pdfIn PDF document text
    • http://jopkapopka.online/pefudofu1gm79.pdfIn PDF document text
    • https://vuwezamubom.weebly.com/uploads/1/3/0/8/130814902/173c2e64.pdfIn PDF document text
    • http://jobware.pro/army_song_video_hdyaarp1a7m.pdfIn PDF document text
    • http://clientbluebadge.com/geloxibisatonimasigi6r8j.pdfIn PDF document text
    • http://metalllift.ru/centurylink_outage_now6h353.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 5416 bytes
SHA-256: e79ba004a2aab2491cadd6d19fddee8881fc8bb860006c08ffdcc2b29984adb8
font_01_sfnt_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 9972 bytes
SHA-256: fb299da87fccbc85fdc524a103d13fd7493605bf43c68fb5a24863b871f8edf2

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