Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0a13799206e141…

MALICIOUS

PDF

75.8 KB Created: 2021-03-26 12:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b1be9deeaeaf2330c2efed5448a6e37b SHA-1: 3f66f2c7739389628438182afb6dcb58fb202520 SHA-256: dd0a13799206e1419e58656e8565843a73779f87eaf820748a2bb10987e90806
214 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 external 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 for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to 'study guide' content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=study+guide+9+part+1+identifying+accounting+terms In PDF document text
    • https://cdn.sqhk.co/dabigewom/RWigij7/make_fabric_face_mask_at_home_no_sew.pdfIn PDF document text
    • https://valowitezud.weebly.com/uploads/1/3/5/9/135993777/zefepupij.pdfIn PDF document text
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/varajuzora_fulifojotaf.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxovugefulo/Kjagdhg/53791225358.pdfIn PDF document text
    • https://wakutoji.weebly.com/uploads/1/3/4/3/134314583/fagib.pdfIn PDF document text
    • http://viwimewi.22web.org/3132600300.pdfIn PDF document text
    • http://jowopejev.22web.org/nodod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wolaniloko.epizy.com/15080481602.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/mit_east_campus_map.pdfIn PDF document text
    • http://tisigivikevutik.rf.gd/lojusufeli.pdfIn PDF document text
    • http://vosivoru.epizy.com/abcd_poem_free_mp4.pdfIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_1a7c7337c1e841ab88694893d3fee907.pdf?index=trueIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_9957dab35eb842f99b7a8afb6ed7a3af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/pejapibanevinojegovuf.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/22126926754.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/91988258681.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/computer_architecture_and_organization_jp_hayes_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/12668614526.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_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 5856 bytes
SHA-256: 453b2add8e06fc77e5e1f70140d9ea0eadb51debaec46b61ed863a6dd5b04838
font_01_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 10568 bytes
SHA-256: 55645a6b618a12923695b3101ccec75d88adc43be64d2af822e52e9263a9ae10

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