Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cf034eb5b973a0…

MALICIOUS

PDF

91.9 KB Created: 2021-04-08 13:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2631fe77fd9d95eafb6e5adf84be77d2 SHA-1: 20633399b9d64b258fda9273b28e4f0ad8fad098 SHA-256: 27cf034eb5b973a0344a345345448530846a0bd75037ce2e55bac9cc5c0a0be4
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. Another critical heuristic identifies it as a link farm, with many links pointing to disposable hosting. The ML classifier also flagged the PDF with high confidence. These findings suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crophysi.ru/strik?utm_term=hamlet+on+the+holodeck+ek%25C5%259Fi In PDF document text
    • http://potolkilife.ru/autocad_2017_tutorial_free5su3m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487194/normal_603956c5332fc.pdfIn PDF document text
    • http://physcoo.com/112278003046odsf.pdfIn PDF document text
    • https://lipopujowojirew.weebly.com/uploads/1/3/1/4/131408954/vuxetekuvagotijilas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450439/normal_5fe797ab0199c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_601672194a25c.pdfIn PDF document text
    • http://tevuvisena.iblogger.org/nixiniv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_60109317bda88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406481/normal_5fc8dbba1ade6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380072/normal_60180ff668cd4.pdfIn PDF document text
    • https://mimejomukokije.weebly.com/uploads/1/3/4/5/134510045/semaragunaji_bekijilad_visojosazi_bakutil.pdfIn PDF document text
    • http://buytoday.cc/irregular_verbs_spanish_present_perfectlpedv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500453/normal_5fd195cd29f60.pdfIn PDF document text
    • http://temppicture.xyz/faxudaxobiwefezabia5sue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_6018e0af19418.pdfIn PDF document text
    • http://remontnatali.ru/943354840767jwt9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478378/normal_60548c0282d9c.pdfIn PDF document text
    • https://moganuvutixeku.weebly.com/uploads/1/3/1/1/131163890/3b28b44023c8376.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dotemifa.epizy.com/building_automation_system_architecture.pdfIn PDF document text
    • http://tivogowajap.epizy.com/bhole_baba_song_video.pdfIn PDF document text
    • http://davamedanaxosen.rf.gd/kuxedubigagubigilu.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/6930426525.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/how_to_find_free_cash_flow_formula.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/70088337339.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/19367479522.pdfIn PDF document text
    • http://fidolujure.rf.gd/21784161469.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/search_engine_optimization_ppt_free.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_off0001250d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250D 5180 bytes
SHA-256: bec195a0f464f4c8e13285a0c89bd2ae29f04070ba8c9c8db5156f29f760291d
font_01_sfnt_off0001367e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367E 13516 bytes
SHA-256: 7c5fb63a6808995cbda98786cada5a698c325d5dea7c4aedf7d81e59d45ef814

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