Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ab7d58c4cf172c…

MALICIOUS

PDF

66.8 KB Created: 2020-11-22 01:19:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cd802191ac5bd03987a10c12fe2c76a8 SHA-1: 1f281bd1db1c58f826674b2c1dbe67f2d501090d SHA-256: 55ab7d58c4cf172cd64c0164ddd81c5ca96729289ac18e1483cce4dc48b18d3f
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://trafftec.ru/aws?utm_term=google+sheets+vs+powerpoint PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f872fc2021c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5f922e7043de3.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/67fce.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/ec144a7a-bd1b-4176-b213-c89ea230c9f6/distributed_systems_principles_and_paradigms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146c042e-3e33-4849-8005-3d8532c6b25e/36913475706.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/avast_premium_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2af7c5-fa1c-4720-8f55-f45a6cc498f6/40518994550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe19760e-f2bd-4c24-a87c-7da025fe6821/legacy_of_discord_cheats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f00f6d-920a-47f0-b547-c6d1daf235a8/visejobajoma.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/misikukojavewitabefutexeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fd37365-db83-47c0-aa7a-94d5339c630c/83121451570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/541b2f88-9b38-46db-8d4a-fbe80fa4de74/creative_lettering_and_beyond_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b11c8d5-f7e6-4cc2-a2e9-d70581e75106/13617691808.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/lujowetavak.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_off0000ca06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 5056 bytes
SHA-256: cfebc63553f0d02c80734531016502bb8f20752aa16a29918fd0827b8fc4b18d
font_01_sfnt_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 10236 bytes
SHA-256: c0cb916014b236c26593595d78ca70d8ec87eae45fbe5e59dda53c3abbb1a620

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