Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e88ad051d006331…

MALICIOUS

PDF

75.8 KB Created: 2021-01-12 14:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: aa7c57e9cee2eb29a38600136b627001 SHA-1: 1782c3c18e6715e47aa954262f167aa3c0498c96 SHA-256: 0e88ad051d0063319e7985deb1e83d89605fbd6887bee558d01f45499c65ce8d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to disposable hosting sites, suggesting it's designed to redirect users to potentially harmful content or phishing sites. The presence of external URIs and the link farm heuristic strongly suggest this document is part of a larger distribution scheme, likely initiated 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://traffking.ru/123?utm_term=btd4+unblocked+games+66 PDF link annotation
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/kuvet.pdfIn PDF document text
    • https://widegavadiwudux.weebly.com/uploads/1/3/5/3/135325068/lanuv-fejuguwerasuk-jevinisopat.pdfIn PDF document text
    • https://dosoludu.weebly.com/uploads/1/3/0/8/130814101/8b0cebe2e466.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374376/normal_5ff89e9413e1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418199/normal_5f9f926e822f8.pdfIn PDF document text
    • https://ginuwedisifixel.weebly.com/uploads/1/3/4/7/134744372/76358.pdfIn PDF document text
    • https://xurulojoxog.weebly.com/uploads/1/3/5/3/135323168/livimobuteregatumow.pdfIn PDF document text
    • https://jajedasas.weebly.com/uploads/1/3/4/2/134234666/rowasubev.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/48855.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/sedimeraxufi/marist_college_ashgrove_uniform_shop.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/birthday_invitation_format.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/city_of_toledo_garbage_schedule_2019.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_off0000eb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 5656 bytes
SHA-256: c6051311f55a0b0add8ef5fd1441fdd2b54e4410bb5ecfc6c1c2f431c340ad75
font_01_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 11044 bytes
SHA-256: 854cc831fcc0be606176e433e0aea2e28465c423d3ab9db3630190e1892db15c

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