Malicious PDF — malware analysis report

Static analysis result for SHA-256 443c995192d52d9d…

MALICIOUS

PDF

62.0 KB Created: 2020-11-22 02:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 42a3f8d0c974719937897fd9580edd31 SHA-1: 2453a528654c923143b1e7fb5e05261f5f72c335 SHA-256: 443c995192d52d9d75ee00292d12973b96893a91b6e01f408423c7e90c72e148
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of a UTM term related to 'casio calculator apk free' indicates a lure to attract users searching for specific software, likely leading to phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/aws?utm_term=casio+calculator+apk+free PDF link annotation
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/205738.pdfIn PDF document text
    • https://guvodirafed.weebly.com/uploads/1/3/4/4/134475496/8adb28eecda.pdfIn PDF document text
    • https://dodewugorar.weebly.com/uploads/1/3/4/6/134686454/6675937.pdfIn PDF document text
    • https://mofasabopileb.weebly.com/uploads/1/3/4/1/134109330/wovami.pdfIn PDF document text
    • https://pinukavuzufov.weebly.com/uploads/1/3/4/3/134307945/a651ff.pdfIn PDF document text
    • https://damilezudof.weebly.com/uploads/1/3/4/5/134599741/d50cf3d7e71fe81.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/kavitokolezub/57501061919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/040a0bea-83e6-419b-a93b-68daee64de36/yamaha_g22_gas_golf_cart_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc30d82e-7629-4aa7-b1d2-5f5da9b0f6ea/kujiloxasapitejutawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a509bb3b-b0de-4f1d-aa88-2669ff33cbe0/70461668455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ce0bdc-f3d5-4af3-8418-04fefaddef34/december_2020_weather_predictions_for_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf8675b3-7b42-49df-9718-8d0d2c1d0e5f/delezojanedavokazod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f7b0dc-10af-4cda-8f2f-76f139ef4719/wufikizev.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/fascismo_na_italia.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_off0000b51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51C 4976 bytes
SHA-256: 1c6cc12b83de3a6cbac5925c20e869c7b89bda7035c47e7c24b45e96e7387a0b
font_01_sfnt_off0000c617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC617 10924 bytes
SHA-256: ad73ad831e2c1251b73b21188c53c518b05d6fb38c2f1c796826ada1e97fed42

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