Malicious PDF — malware analysis report

Static analysis result for SHA-256 016833f267e367ba…

MALICIOUS

PDF

76.8 KB Created: 2021-05-28 19:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8d5102ba9d8c78110f93769d36f9c3dd SHA-1: c2d5a3b680fd6b3306337fdded2124341e4c637e SHA-256: 016833f267e367ba1c8d9b45b577ddf25b257db9c38d8a42a336d1d9b7dcacdc
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 large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this as malicious, specifically a phishing trojan. The embedded URLs suggest a phishing or malicious redirection attempt, likely delivered via spearphishing.

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://dugedepap.ru/strik?utm_term=what+should+i+write+in+impressum+on+facebook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495246/normal_6043792f346a4.pdfIn PDF document text
    • https://teditiwos.weebly.com/uploads/1/3/2/6/132681477/faxulezelatume_segoza_dofowepepa_teragug.pdfIn PDF document text
    • https://walotowujiko.weebly.com/uploads/1/3/4/5/134582573/losijatujivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452389/normal_600b469b11d0b.pdfIn PDF document text
    • https://xuvodovujekezoz.weebly.com/uploads/1/3/5/9/135957716/wegevomigemuzex.pdfIn PDF document text
    • https://dodivivedi.weebly.com/uploads/1/3/3/9/133997878/xigamanegexofi-tagavuwu.pdfIn PDF document text
    • https://datafixujur.weebly.com/uploads/1/3/7/5/137516556/zufuto_kuwukoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423462/normal_5fd2420060ca7.pdfIn PDF document text
    • https://fusodozot.weebly.com/uploads/1/3/4/0/134096428/dijulezajivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_601b446885dd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_6015a062e0fd8.pdfIn PDF document text
    • https://lefasibemaji.weebly.com/uploads/1/3/4/5/134589759/sojowizifepe.pdfIn PDF document text
    • https://ramasiwo.weebly.com/uploads/1/3/5/3/135390431/bijutijokup.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/ccd52efd-1996-4eca-8952-d6a235b2cf46/ritigomisidefolekobupiliw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83663868-d6fd-49f0-9a12-a6646877566c/nigepenoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b159ac3-d9f2-4c1c-8944-00799e2df45c/logitech_k800_wireless_illuminated_keyboard_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0016ad7d-54cf-43ec-be17-0bbb86080ad3/96220285055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ee2aa6-e881-4bcb-ae99-67034d8acca7/pabipimorubuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7dc70d-6338-4847-b0ce-75cef1d7d963/34127948535.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_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 5704 bytes
SHA-256: e31bb1d1af1a510d7964bafac3500d33cfbb9a359abe124a803d04f44868fe9c
font_01_sfnt_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 10496 bytes
SHA-256: 643c7cfaa9bc9375df7627c3ed519932e77e1f7b85d3af80a9021e51e03d2c53

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