Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3a6e549e06a3ca…

MALICIOUS

PDF

67.8 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: 61659a53b87b5360c8cfb9000a2b4b18 SHA-1: fe5b2f61614498e6b3271e4196bdf6c71bd66fe7 SHA-256: 5e3a6e549e06a3ca053a441a2012f2dc6acd177a780ed35fba7134e6814e3438
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 a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic findings point towards the use of this document as a lure to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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 1

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

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