Malicious PDF — malware analysis report

Static analysis result for SHA-256 6824f24deedab1f7…

MALICIOUS

PDF

81.5 KB Created: 2021-05-19 13:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0eaddb58c9c9e5f94d830a8fffd81a66 SHA-1: 9052975730ef684b5ab1aeb9f722a2dc38f1a1c7 SHA-256: 6824f24deedab1f7a561308b55676fea97c8872605063bab0b1f14013bb1ec9c
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The file contains a large number of embedded links, many pointing to disposable domains, suggesting it functions as a link farm for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/strik?utm_term=what+animals+live+in+the+desert+and+what+are+their+adaptations In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_60358997064f8.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/newawizuwowilapivuse.pdfIn PDF document text
    • https://wederubumojap.weebly.com/uploads/1/3/5/3/135393822/jiledofe_luwatedomafagum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485821/normal_6056c6f90623e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401545/normal_605e06fe419d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_606767e4c0bf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_603ff188c9ae1.pdfIn PDF document text
    • https://kowuzuworos.weebly.com/uploads/1/3/2/6/132682574/fasid.pdfIn PDF document text
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/9accbc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452863/normal_604d24e33f6a9.pdfIn PDF document text
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/tigizipaxe.pdfIn PDF document text
    • https://nasuvanebi.weebly.com/uploads/1/3/5/3/135393195/lamelusoriruvakige.pdfIn PDF document text
    • https://wilosobofixi.weebly.com/uploads/1/3/4/8/134858013/lebededoxovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_603b7997d349a.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/limepusotanal/gegusexu.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/juvamozawuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d60f682d-0366-4283-bba7-ade4bbc60e1c/rosario_lagrimas_de_maria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ebfb3b-3eb1-46a7-8f7a-b5675794b665/49619511785.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/ejemplos_de_conectores_causa_y_efecto_para_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/idfc_limited_annual_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/935d6a80-fa99-4757-a19c-0b305090a76b/integrate_x_cos_x2_dx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0221200-1b85-48c0-807e-8dcea0021eef/karl_marx_le_capital_gratuit.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_off000103eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 5364 bytes
SHA-256: 0926a6fa14c0a1518f19f378996326c518ef81654f08db0b13a4a340a4f9d41d
font_01_sfnt_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 10008 bytes
SHA-256: de567cf1495c4e01ec0f3df87d050aa444d44c97c85a00cba917dd3bfb58b324

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