Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6d22dd53e56fd7…

MALICIOUS

PDF

60.9 KB Created: 2020-11-18 01:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e18034d93d05978ace540eeb229242ff SHA-1: 9c12494f7c8a96ea11e6175d04c156043532e69f SHA-256: 4f6d22dd53e56fd7f58e5908a0057291a241d9e37323ec778ac5499ea8528a5c
186 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 0.9996

Heuristics 6

  • 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.
  • 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/123?utm_term=kenmore+ultra+wash+quiet+guard+4+reset PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423750/normal_5fb2c7673e63b.pdfIn PDF document text
    • https://luwinititik.weebly.com/uploads/1/3/4/5/134587042/fewenigemu_burime_bojomisev_bimuruw.pdfIn PDF document text
    • https://wulodegekejiwa.weebly.com/uploads/1/3/4/2/134266030/0159b0a.pdfIn PDF document text
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/sawewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5fade14485221.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/010fdcdf.pdfIn PDF document text
    • https://jijukufopu.weebly.com/uploads/1/3/4/7/134735153/kimepeke-bugejemo.pdfIn PDF document text
    • https://walutosewog.weebly.com/uploads/1/3/4/3/134312240/fotuzulur-jawupedab-dumibufapanot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_5f8fff011f356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_5faa704c1cb81.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/zinudipir/kunijewaligevike.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/psas_school_pueblo_co.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2621ca8a-2cfb-4832-8d56-2bbae67871d1/lobozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a909a0-32fb-4f63-b918-1f75ccf2769b/28214317396.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_off0000b064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB064 5512 bytes
SHA-256: a76a92adf3cd8522e13afb41df17199bf5e3a4e166d681278d1530fcd85ec775
font_01_sfnt_off0000c303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC303 10096 bytes
SHA-256: 1b69d131f84e2da3c715269cedfa8320ae3b330ab2d5198ff9f789936e5f175c

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