Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e2849b650e015f…

MALICIOUS

PDF

66.5 KB Created: 2020-12-03 07:26:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bef2a5c9d5ee1c65ff56b9446c0efd59 SHA-1: 780876b1bafc78e8a928c4c65a1859d733f8d826 SHA-256: a0e2849b650e015fb41214300dcad57640c149643e450cc6340925fa7b1cddd8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to 'Ielts essay writing book pdf', indicating a lure to download further content. The presence of embedded URLs and the link farm behavior strongly suggest a phishing or malware distribution attempt.

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://trafficel.ru/123?utm_term=ielts+essay+writing+book+pdf PDF link annotation
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/vovadigasesamarazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_5fc0960004aca.pdfIn PDF document text
    • https://zupuxugemewizo.weebly.com/uploads/1/3/4/3/134309945/c24850935.pdfIn PDF document text
    • https://bigorofepomibed.weebly.com/uploads/1/3/4/4/134400252/lusakedisizuvusi.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/zunuzikuzelizusiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454822/normal_5fa17d2845f0a.pdfIn PDF document text
    • https://dimomivij.weebly.com/uploads/1/3/4/5/134504604/5999546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5fbb692f36784.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/2efbe2ad-24a7-4683-8d23-4a2a61c9753c/wavutik.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/articulation_of_form_in_architecture.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/24805203997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cfd78e9-9c9f-4eb8-8f16-e9c9645388d8/fraction_et_demi_droite_gradue.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/us_navy_cadet_uniform.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_off0000c847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC847 5544 bytes
SHA-256: b5470d6c2da93c03089e9ab6907ddb2daf27defe75e754b38743fb7c2e738b65
font_01_sfnt_off0000db50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB50 10100 bytes
SHA-256: 9d229348127c1dd0b97aedee3cdabe268187c5aedf2bc82d2a10f32842a0d6d4

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