Malicious PDF — malware analysis report

Static analysis result for SHA-256 a057f8a8519dd355…

MALICIOUS

PDF

84.4 KB Created: 2021-03-05 12:24:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 37760a56ced77a1e172fa906e7562fc9 SHA-1: d30103d78a49c599f66548e1150623ff59454c68 SHA-256: a057f8a8519dd355d347bb32433cb9bbf1f8f519dbdc33ece5d8d838a97e320c
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 0.9998

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://xajibur.ru/wix?keyword=toefl+official+guide+2020+pdf PDF link annotation
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/f5305cc5f34c04.pdfIn PDF document text
    • https://betozuwozoz.weebly.com/uploads/1/3/4/1/134108580/e2a428d2a0a3be7.pdfIn PDF document text
    • http://de-bewertung-889562.icu/repair_hp_laptop_motherboardx19b4.pdfIn PDF document text
    • http://m-laskin.ru/36614567253v5am4.pdfIn PDF document text
    • http://wgathering.org/gatitimokewz55zq.pdfIn PDF document text
    • https://sarogixi.weebly.com/uploads/1/3/0/8/130813770/2446769.pdfIn PDF document text
    • https://palujaburufo.weebly.com/uploads/1/3/2/7/132740236/5771172.pdfIn PDF document text
    • https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/6906923.pdfIn PDF document text
    • https://nakigere.weebly.com/uploads/1/3/4/6/134608851/7292f.pdfIn PDF document text
    • http://goodsfor.life/39046642364ilfoa.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/posaxugidut/wahl_trimmer_charging_cable.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_7ecf7df838ae4673a5c8caad10556059.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d81337bb-32ea-4969-8c05-62779932f5d0/xozuniwifafepolamubavutu.pdfIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_07c0017f43204ee181342f8ce2cf09da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/65816757169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0429d28-ee35-4dd2-a264-12f32eeb48e1/zabeboged.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 5272 bytes
SHA-256: 9a5063b86255140216db6dfe18c0bf152867231b7bf565b96abaae378e96f691
font_01_sfnt_off00011870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11870 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 10408 bytes
SHA-256: fa4bbe6620d52eb930fd5676572c05375a00da9ce1d6418032708e86918c2e2f

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