Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae91819e143043a…

MALICIOUS

PDF

73.7 KB Created: 2021-03-22 20:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 922da1870216d2928798e587efc3b71e SHA-1: d667e861f7908b5005b13d37c6a38c96f3265441 SHA-256: 0ae91819e143043ad2aaa42013fb16fdcf61720d24d2b2c31b2edb211971e9c3
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a large link farm. The embedded URLs suggest a phishing or spam campaign, likely aiming to lure users to external sites. While no scripts were extracted, the sheer volume of suspicious URLs points towards a malicious intent 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=facebook+video++iphone+x In PDF document text
    • http://kadaxejob.mypressonline.com/nibilowolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478422/normal_604949723ef82.pdfIn PDF document text
    • https://pevopuxavinedun.weebly.com/uploads/1/3/1/4/131406680/pevemudofofuz_neliz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444356/normal_5fcbf157aa162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501486/normal_60554ebb8d579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475999/normal_60580c598438e.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/how_to_understand_integral_calculus.pdfIn PDF document text
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/luzobubewogukap-pewowowu-mugililelek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454971/normal_602ac15a85f51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393889/normal_601c9a7f6752d.pdfIn PDF document text
    • https://boripate.weebly.com/uploads/1/3/4/5/134590871/sobozalejanifej.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/norton_reader.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_e8a5d37276ae48c39f716fb3a6f047b7.pdf?index=trueIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_1e0739246a8e4cba9bab01fbd316470b.pdf?index=trueIn PDF document text
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_da7fd83dff944de1978532943acbb878.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/computer_science_books_list.pdfIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_0cfe318a022e45dbaea806a946c21368.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/artificial_neural_network_definition.pdfIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_321ed4049b3543a683ce75f73ffcc338.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_off0000e2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FB 5140 bytes
SHA-256: 194a861960d02b2e026f50c89d7469be7cacec6dc147611ba9ed7ac082f05b95
font_01_sfnt_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 10572 bytes
SHA-256: a206d974b9340762fbfdb7878dc47bd4716bc3f45820bdfce6675a6b131c1732