Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44c83b681c146ab…

MALICIOUS

PDF

68.9 KB Created: 2020-11-14 04:13:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2fc2cc7495091ee2caee5c01f62ed4c9 SHA-1: d470d2dd84b8cc2965799634bd30d1787a29b628 SHA-256: a44c83b681c146ab5a40ef4b0082e0c1085b6595145a458c87b8871d10cd4285
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://traffnew.ru/aws?utm_term=my+autograph+tamil+movie+songs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455881/normal_5fa39e03783f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417527/normal_5f9ba28f2e79d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_5f9da0b448ef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_5faea916b8444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5faee70f3235f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_5f95c190b62ce.pdfIn PDF document text
    • https://tadafami.weebly.com/uploads/1/3/4/3/134386911/pisumove_nigemo.pdfIn PDF document text
    • https://jesokawafaz.weebly.com/uploads/1/3/4/6/134626724/725f0cae420.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/7e7a39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476780/normal_5fa50d8c4244e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378621/normal_5fa8a9c0ecc9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c294e9-f7ad-4621-9f78-59b8a348d2ad/swtor_space_missions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f3e1ae-1108-4c74-9570-35bd8dd281a4/significado_de_antropometria.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/tibixi.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_off0000cf13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF13 5400 bytes
SHA-256: 0a0dd0d626fde0b69c3fe5e841a47195d49bb7d1355c620551bcc3866dfbfcc5
font_01_sfnt_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 10960 bytes
SHA-256: 8ac8a3a16bf7dc4440afc59a29c93a69eef57904d560762776b3e056f2d643b0

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