Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4d9fe519065565…

MALICIOUS

PDF

69.2 KB Created: 2020-11-13 05:50:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 802eaa9f264c442ddb0fbaa1d7e81a3c SHA-1: b723ccdadb44644008fa2895ecbe1eb5efe73be8 SHA-256: 3b4d9fe519065565d4ae4d3b48a10dd234ec590141aa14845113c2838f4cd5da
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, identified as a link farm, suggesting a deceptive purpose. The presence of ClamAV detection and ML flagging indicates malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links point towards techniques used to redirect users to potentially harmful content.

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://trafficel.ru/aws?utm_term=unity3d+android+deep+link PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379971/normal_5f8defdb69701.pdfIn PDF document text
    • https://kexeluki.weebly.com/uploads/1/3/4/6/134627649/1080082.pdfIn PDF document text
    • https://direvegafazago.weebly.com/uploads/1/3/4/4/134491376/dd66e1e4d28.pdfIn PDF document text
    • https://sewobefavewekog.weebly.com/uploads/1/3/4/3/134367647/levibinoji_wunidafate_sujarujepoleko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_5f9708d9181e8.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/xalediwajuja-jupomezebu-xezozasemijofop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417824/normal_5fa0a7224f953.pdfIn PDF document text
    • https://kugugurufive.weebly.com/uploads/1/3/4/1/134108893/sosewofumulon_pidudaxewiv_sisowija_fegibupafemil.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/woberiz/multiple_rbx_games_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bcce431-5470-4f77-ba88-d430e8dadc20/debijukubodufob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b1c4e0-cb51-45f7-b453-1e033764bfbd/jiwerafuk.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/41932497320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/074bb3e5-bde5-4d72-8762-a4d226df6dba/gamodusakomofunimezoviz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb9dc5ea-8040-46b5-a8e8-49e5db7dc144/90574302457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59702e9c-bd69-4f87-9dae-ab0eb05b3d76/educao_e_tecnologias_o_novo_ritmo_da_informao_kenski.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_off0000cff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF6 5096 bytes
SHA-256: 8b8d3ed76ed8bf11058adcd57fa394cbed67969675b103f641539fb0a35eb67f
font_01_sfnt_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 11228 bytes
SHA-256: ea26142013193382417003e64dba493ea367cad02e6b0bb09001a9834ecd1173

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