Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea88dc4d4a2c165…

MALICIOUS

PDF

61.4 KB Created: 2020-11-24 13:04:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6154844f9b0ed5992ac21f31945953d4 SHA-1: b2e138b891e2da9d0e437bdba49611958a2b7a4b SHA-256: 3ea88dc4d4a2c165e41d391db63899e0a81fb6005b2d665f4b3ead0a4a6f2b1d
156 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 external links, many pointing to Weebly-hosted PDFs, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these linked documents. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/123?utm_term=car+wash+coffee+road PDF link annotation
    • https://xisaluzesa.weebly.com/uploads/1/3/4/6/134602292/0af5f6.pdfIn PDF document text
    • https://bevugatumuga.weebly.com/uploads/1/3/4/3/134316863/xapukigaguwat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452385/normal_5f9f7a7a27bec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5faa79cc16837.pdfIn PDF document text
    • https://zinivopupo.weebly.com/uploads/1/3/4/3/134386920/427943.pdfIn PDF document text
    • https://tonulolini.weebly.com/uploads/1/3/4/3/134341491/423421.pdfIn PDF document text
    • https://tekadepaja.weebly.com/uploads/1/3/4/3/134341299/fee99c6cf71ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480579/normal_5fb8b44831083.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/3909325.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/jexijer/pirawalajetezuzezeli.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/46699214113.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/bachiko_nannali_kannada_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/fijiduzuzozabazimij.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_off0000b55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55A 5072 bytes
SHA-256: 19555799080193e4ee0ea5ed95e1783e206d3a3d24d1757ac2c3c00549e625f7
font_01_sfnt_off0000c6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A9 10064 bytes
SHA-256: ebb3a5ddc9ad44279c9deac0cab7f6f88b3911e2c4ef5822371dafe53279577e

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