Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de586a75619904f…

MALICIOUS

PDF

75.8 KB Created: 2021-05-29 07:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 18779243f436d8b86d26b9e25e18285a SHA-1: 0b84ec44b1e26210d6018628c15bb9c65472dba9 SHA-256: 0de586a75619904fd81850e7b56c0cd9677bdba921da90aa2651c151fc209272
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains, a technique often used for SEO manipulation or to host phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure itself is indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://baarspo.ru/strik?utm_term=what+football+is+on+tv+on+sunday PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381090/normal_602b8033b1163.pdfIn PDF document text
    • https://bokasaveti.weebly.com/uploads/1/3/4/7/134725866/figazebivu_purodakup.pdfIn PDF document text
    • https://lovefuzabuzonif.weebly.com/uploads/1/3/4/1/134109130/f7ff613ef3fecf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409630/normal_5ff6673e2e4b2.pdfIn PDF document text
    • https://xudidetopos.weebly.com/uploads/1/3/4/5/134579215/9791982.pdfIn PDF document text
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/629c3582.pdfIn PDF document text
    • https://kukonugaxa.weebly.com/uploads/1/3/5/3/135327287/4470599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413017/normal_6047fd49f384a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404490/normal_5fe4fdbb8a487.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/soranobas_debikusebet_fuxate_ravon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_6053a9663c23c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4383798/normal_60aff11469833.pdfIn PDF document text
    • https://riwumoba.weebly.com/uploads/1/3/5/9/135965326/054c3c0ae39b5b4.pdfIn PDF document text
    • https://bakogala.weebly.com/uploads/1/3/1/3/131384254/nadalelakalovezob.pdfIn PDF document text
    • https://jodawebodo.weebly.com/uploads/1/3/4/6/134634345/0990bfa601d27.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/0922af00-51d4-418c-a6ba-0de3bd4804d2/what_is_an_mcq_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/688a6214-cbb2-49f8-9f38-e7ef0de3aa94/wawepoxunuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db8b82a8-3efd-4f3a-9626-801ab7ceb40f/hp_7520_printing_issues.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_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 5212 bytes
SHA-256: 761acd4d9e0bb2b1a520fd364bfb2b1dc71f22242a353b8d8ac038bc1a5f78f7
font_01_sfnt_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 10968 bytes
SHA-256: 86e0967bcb9b623e02cf619f08a3d8dd14e524e9afc8d62084ddc2c361d8f278

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