Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aaf65e072549566…

MALICIOUS

PDF

73.1 KB Created: 2021-03-14 18:09:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e3c0aeff0efdf8cc240af0d5aac0746e SHA-1: 66b44aaa1f1c0e916fedc85f0a3a4610159203b5 SHA-256: 1aaf65e0725495663e970951811727a2e413ebd7026bf92199642549c7df2ccc
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://crophysi.ru/strik?utm_term=where+can+i+have+something+spiral+bound PDF link annotation
    • https://wisowoturap.weebly.com/uploads/1/3/1/4/131453432/fojaxegazikawat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369161/normal_60365603207d0.pdfIn PDF document text
    • https://cdn.sqhk.co/talidapato/fSggifr/muromufelepirasepa.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/bPjajcd/annual_bike_race_in_france.pdfIn PDF document text
    • http://wofomeko.22web.org/100_to_1000_in_words_in_malayalam.pdfIn PDF document text
    • https://kabuvegezukab.weebly.com/uploads/1/3/5/3/135325093/wedavinuba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389582/normal_5fcc66c4a53cb.pdfIn PDF document text
    • https://malugeko.weebly.com/uploads/1/3/1/6/131636988/fonavejomenoxuk.pdfIn PDF document text
    • https://zumokijux.weebly.com/uploads/1/3/5/9/135966910/746601.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/9dfe46bd-7959-4cdb-a624-bdd5f3f7af81/have_yourself_a_merry_little_christmas_sam_smith_piano_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff2bbb0-71ec-4b84-bf66-5a8b3e22ddb0/62056010659.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_298c7daab4944abf93a58fb9ebaf1725.pdf?index=trueIn PDF document text
    • https://bfb79b04-db4d-4c54-a74a-4733ff68ceb9.filesusr.com/ugd/11291b_738ea21cc3a24cf48ef7e3acda05a4d5.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_2934f1a56a17443b92f82f51c4e5cf88.pdf?index=trueIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_7c6abf5ee5b8461c994ef70f5b7656eb.pdf?index=trueIn PDF document text
    • http://pijewelonixu.epizy.com/24158855411.pdfIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_4bc5de78e33d412ead61ad60032cd1be.pdf?index=trueIn 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_off0000de05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 5700 bytes
SHA-256: d507157b01d73d996bb4e840f17cdf110419dc35f58db7604b8fcd5f76ca41ce
font_01_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 10628 bytes
SHA-256: 8f0140612f19c9b2bc9740f48f49fd3610d9ad7ff80d5dfea1edb09edba4896a

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