Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec0c144cfee1c6f…

MALICIOUS

PDF

72.8 KB Created: 2021-04-30 19:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 15782a888986abea0b507848eda98192 SHA-1: b10f13d5b56d108a7a1e5318fea10df6b88830b8 SHA-256: aec0c144cfee1c6f945f462b0a353102d2fe0058f2fc12ecae0512951432ccb5
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely aiming to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9074

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://soxebez.ru/strik?utm_term=english+conversation+lessons+for+beginners PDF link annotation
    • http://vulemese.iblogger.org/janonulirojawarowiwiga.pdfIn PDF document text
    • https://kaxawoxo.weebly.com/uploads/1/3/1/0/131070710/vegapuwefazupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_605f72c7b132c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456666/normal_604370984d7a7.pdfIn PDF document text
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/lukeros-lamamanewisod-sofetise-zagisavozi.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/5370013.pdfIn PDF document text
    • https://toxujubew.weebly.com/uploads/1/3/1/4/131437446/petorusape.pdfIn PDF document text
    • https://pifabevab.weebly.com/uploads/1/3/4/7/134721676/kigiravalorol_ditimutu_savoj_xagawumokaf.pdfIn PDF document text
    • https://kuginipa.weebly.com/uploads/1/3/4/8/134853520/3234652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_6016e4320ac60.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/guvovigo/jewapixapaxawowago.pdfIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_54277c87b19d429bac1245aa26c5ee1c.pdf?index=trueIn PDF document text
    • http://tuxugev.epizy.com/zaxameduxagadikenizewaked.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/gejofuwakibux.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/384417871.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_59c076aa1e264840a5c08b9c503e3775.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_f4c4761f82df4f679beb728d325bbd2f.pdf?index=trueIn 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_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 5300 bytes
SHA-256: 83921d025cc0ce439bcf56cfab3493c258b1760fa1ef65c25338707ab6bfbe1d
font_01_sfnt_off0000fed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 10968 bytes
SHA-256: 7eb6af88d4fd9459320e69ae9aa582eadad51e418e56342a8ae4ecf3621b4465

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