Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ca98b50d28dbcf…

MALICIOUS

PDF

65.1 KB Created: 2020-11-25 22:36:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f49488bb3224a806fded434cb4614cde SHA-1: 98750e871b32716922686cd99a72c9e5f09a8a05 SHA-256: f1ca98b50d28dbcff54043bffdcfce9c0e9534bc70457d83e894cf29f6823b5a
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/aws?utm_term=quarterly+exam+question+paper+answer+key PDF link annotation
    • https://kigibituridugu.weebly.com/uploads/1/3/4/3/134352406/negur_galasufo_bofed_gutuboninofad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5f911ebb14b6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_5fa9e537d4e1d.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/lakutidunaxoge.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/5357621.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/2580569.pdfIn PDF document text
    • https://retizulavupax.weebly.com/uploads/1/3/4/6/134653187/3a2ad984f.pdfIn PDF document text
    • https://bawokotofebadu.weebly.com/uploads/1/3/4/5/134507933/7839229.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/dc08d274-8d17-41a2-b17f-35aa60dd6583/73749098916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51832fcb-d62b-46dd-afef-d965c602e6b6/60211314412.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/zofekuxix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e04701a-fe2c-411a-8ca2-fc3e07d6441a/king_george_public_schools_jobs.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_off0000c141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC141 5476 bytes
SHA-256: 9c1b2d35109148aaecdb3b0df3b61ac387dba9b142a8df22ca62de5bd2c5eb90
font_01_sfnt_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 10632 bytes
SHA-256: cacd25dbba829e4ed7d825f8496b571efbd4c87072695699aaa524ec41638f58

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