Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2fd279d05aebcf…

MALICIOUS

PDF

70.6 KB Created: 2021-02-21 23:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b8ab416e9c66dd6d646713801b17c2ed SHA-1: 2e983767ccfe78ee4839e3a1597a2f7101b6119e SHA-256: 8f2fd279d05aebcff895553c5910c5551eb9390bb783b6888bff320b506402e3
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a "quantum numbers worksheet" lure. The heuristic firings indicate a link farm hosted on disposable domains, suggesting a phishing or SEO abuse campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to malicious sites or download further payloads.

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
  • 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://jacksth.ru/wix?keyword=quantum+numbers+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367959/normal_60317af24ce6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464527/normal_5fda49a35d437.pdfIn PDF document text
    • http://jevufoduxixan.22web.org/junior_scholastic_answer_key_november_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459188/normal_601ed73b4dcb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403429/normal_5ff955d86cf35.pdfIn PDF document text
    • https://sifegofariwe.weebly.com/uploads/1/3/1/4/131437131/lipodopati.pdfIn PDF document text
    • https://fifubinagate.weebly.com/uploads/1/3/4/8/134854053/9a85d49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416798/normal_60288a0ac2d6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377410/normal_602eb532a3103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_601331aa1bfc6.pdfIn PDF document text
    • http://vetapako.22web.org/vadidekupopidixavup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460678/normal_5fed0251c2fb3.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zinuforonubas.rf.gd/71927010144.pdfIn PDF document text
    • http://segixiw.epizy.com/zamelawuzusudabazofotel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE21 1964 bytes
SHA-256: cafc66053d53eb8e3277a25bdee2e7701b17d43b20e552da9cba7d884a1a5f39
font_01_sfnt_off0000d76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76F 5252 bytes
SHA-256: 25e9b55715ffe9d4ec5550a6378d5007bd0258d3d8f9b7395dc4d7ddca84bc59
font_02_sfnt_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 10640 bytes
SHA-256: fe5cf93710555179df8db46432ef896e25136838df7c3592c4908f2f59d986d4

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