Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa88d21423040a2…

MALICIOUS

PDF

67.1 KB Created: 2020-11-20 11:19:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 43ae3c0fe5bc42f2cbb66eb37ad4b833 SHA-1: cc70797b1ca19098436611d12722b4b6ed2c8a1d SHA-256: caa88d21423040a2b7746e78f31c5b6fcc89cb8b6beff1781441ecaf4cad08dd
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or SEO abuse tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'English activities worksheets pdf', likely a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://cctraff.ru/aws?utm_term=english+activities+worksheets+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_5fa63727d0c58.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/lanesesubixata-ruxisodufuset-tofuwaxe-ruteko.pdfIn PDF document text
    • https://zevodajiwagadiz.weebly.com/uploads/1/3/4/3/134340874/zejokanakezewitowogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_5f9ef7921478a.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/bepobidugiwizejiz.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/jeduzizonox/94083393393.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/manual_for_garmin_drive_51_usa_lm.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/fixukomemok.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/fofodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a8f35d-9566-475f-9083-d7f5f97b4d42/76055445487.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/the_book_of_enoch.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/8194877736.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/yorkies_for_sale_in_henderson_kentucky.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/packer_marine_terminal_philadelphia_tracking.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/jazuzubeka.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_off0000c71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71F 5588 bytes
SHA-256: ff04d19bd3cc3d4b124823684e11818c44309cc4df11ddf67c26ed567204f73f
font_01_sfnt_off0000da44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 11500 bytes
SHA-256: ca5c8a25f3272beb618d7f15828d34ad6214909a26c24b8e147f4335fa905706

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