Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c51e3948ca36798…

MALICIOUS

PDF

78.0 KB Created: 2021-03-27 17:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a230355b83128d44aac6cea10846e507 SHA-1: a3de3c0da8b8e44780fb68c318747dd194ee80cf SHA-256: 9c51e3948ca36798f0b7060cb78c1bb8f15ab6510db972c1c4f12103c197388e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a disposable hosting service, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/award?keyword=pop+music+arrangement+pdf PDF link annotation
    • http://yourbigdick.space/4102359848eje1y.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501654/normal_604b7f66a385c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461744/normal_5fea23c97b3ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407331/normal_605ee443c4706.pdfIn PDF document text
    • http://reweder.site/azure_machine_learning_models_cheat_sheeteoy9h.pdfIn PDF document text
    • http://select-get.top/what_are_the_objectives_of_databasespy13.pdfIn PDF document text
    • http://detonic-official.website/talking_panda_apknareo.pdfIn PDF document text
    • http://healthit.space/tutafikalaburoval.pdfIn PDF document text
    • http://slampochka.ru/spoon_river_restaurant_belhaven_north_carolinawwhiw.pdfIn PDF document text
    • http://moitender.org/54160279455has2p.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/20696056418jii7l.pdfIn PDF document text
    • http://obmenkalnr.online/78811164357s8ko7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzodunewawet.epizy.com/dream_girl_movie_free_torrentz2.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_62fb561fc3f442ebabb6e83833112957.pdf?index=trueIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_4da78037422844a3a9135e1028b9b9b0.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_2ddd043d83f74343a7d8a95392c21335.pdf?index=trueIn PDF document text
    • http://valamujunitun.epizy.com/haryana_b_ed_scholarship_form.pdfIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_3b778504e04c444d887abad616db2034.pdf?index=trueIn 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_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 5444 bytes
SHA-256: 3ab7b738a6bd6736c33b5e66dd19c90bb883d7435c39ffe567e85434f4bb8b98
font_01_sfnt_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 11444 bytes
SHA-256: 26b3f5d02acbe2901c07e3385ed3574e59ce368fc48fce756116f1596346e1e8

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