Malicious PDF — malware analysis report

Static analysis result for SHA-256 f210dd141f908960…

MALICIOUS

PDF

71.3 KB Created: 2020-12-19 16:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: adf64ff06727b5d0940e7382f962a399 SHA-1: d5f39ad006bc0187c30c116f9219d48668cd618e SHA-256: f210dd141f9089609c22eb3eef10420fe6862d3cc067392200fb37832efa7afa
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and a link farm suggests the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=elizabethan+theatres+facts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472221/normal_5fa84d9e3da4a.pdfIn PDF document text
    • https://naxupezo.weebly.com/uploads/1/3/4/3/134350891/biraloxa.pdfIn PDF document text
    • https://genifefesabido.weebly.com/uploads/1/3/3/9/133999330/tofusepasiminobepaj.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/faporewob.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/18c896a3eda4f.pdfIn PDF document text
    • https://zoxipunawogedo.weebly.com/uploads/1/3/4/2/134235683/6cdcae6d1f500.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/fetotuxuwimi-vokurakemusuter-simuwore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_5fbe2959a45ca.pdfIn PDF document text
    • https://mufanebix.weebly.com/uploads/1/3/4/3/134349193/4d21aec.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/0f512028-e2dd-4a80-a207-9414402a36a1/kite_runner_audiobook_chapter_6.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc781e15c272238a81a89ed/t/5fcbf18ff94b6402b203095d/1607201168638/tidekekunom.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/dvd_stranger_things_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/liligenalox.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_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 5116 bytes
SHA-256: 25281dba5bb0fa98a1c010a3ad492f10b16ee715d1c96004f351135bbbabfa6c
font_01_sfnt_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 11788 bytes
SHA-256: 2ec03796494bc72fdd32e13ab03bfa967c1dfc3b85d41945c63b790e87c6874d

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