Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd338cab9545556…

MALICIOUS

PDF

72.6 KB Created: 2021-06-05 01:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f3364389e1df8d90525533668f600dc6 SHA-1: 213c41e29221c0226728cde4c28c150eb0bbbfe8 SHA-256: 8fd338cab9545556fe16d822de3d3e30a00227e29ccdf219a35cd7f6ef7a6aa8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://medvor.ru/pbw?utm_term=what+is+the+youth+justice+system+uk', is likely part of this scheme to drive traffic to potentially malicious content.

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://medvor.ru/pbw?utm_term=what+is+the+youth+justice+system+uk PDF link annotation
    • https://dodesigaf.weebly.com/uploads/1/3/4/6/134656612/gimomibe.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4479916/normal_60afe793bbf47.pdfIn PDF document text
    • https://labimatejodo.weebly.com/uploads/1/3/2/3/132302966/30d5198e51bf69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_603884839d5af.pdfIn PDF document text
    • https://wexotagupoma.weebly.com/uploads/1/3/2/8/132814474/pifixu_rumaweziteg_womizexufidomo.pdfIn PDF document text
    • https://fubediko.weebly.com/uploads/1/3/1/0/131070718/pezul.pdfIn PDF document text
    • https://pebizadovabunal.weebly.com/uploads/1/3/4/7/134711288/f5963086fe798.pdfIn PDF document text
    • https://pedudevapo.weebly.com/uploads/1/3/4/7/134719514/vedefisepuluxapimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_6037932ea6ee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465400/normal_6066cb1177222.pdfIn PDF document text
    • https://zoxanomo.weebly.com/uploads/1/3/1/1/131163640/wijadasepexa.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/e5be65de-431b-44f0-8a82-2bc12cc63700/panasonic_kx-tge233b_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b1d83b-0469-48c4-9f0c-f64c98186d1b/86793949538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0139861f-28dc-43c3-86c3-ab967009d2ea/88083137432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8937af-f5f2-4ab1-b8ca-27bc990645c7/how_do_you_end_a_descriptive_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32fcc6b1-c067-4447-b760-29a6dcc039dc/cognitive-social_learning_theories_of_personality.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f179e5-5009-403a-8fb5-fe28f4549cf8/what_is_a_good_hesi_exam_score.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91522ec-1409-48f0-a483-2e2e2d532c65/47509124623.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_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 5168 bytes
SHA-256: 3a1a1c3545f9c32068765f2e7f0d3199aa39ea9281aa4bd234875bd78a528a9f
font_01_sfnt_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 10628 bytes
SHA-256: 8056e5c5a10a81cd56a340aafe09bde6353deb0f4e889d2df2d8a5d24350bd68

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