Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7835d86c6a8c2a2…

MALICIOUS

PDF

165.8 KB Created: 2021-03-26 11:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 20a23b1a18a3e8c5086c78acebcd6a18 SHA-1: 708d5959c45ce6fdc133b95fd2ecb7e6efd7adfd SHA-256: a7835d86c6a8c2a2d8134e0134f84a4ce6dccb9229855f1491415e32f8780e69
126 Risk Score

Malware Insights

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

This PDF contains numerous external URIs, with a primary focus on a URL that mimics a search result for a specific document. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9826

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://maypoin.ru/award?keyword=bertrand+russell+religion+and+science+pdf PDF link annotation
    • https://pegufozexak.weebly.com/uploads/1/3/5/3/135317465/29e52eedb82fd.pdfIn PDF document text
    • https://gegefajowib.weebly.com/uploads/1/3/1/3/131380265/df5b8346ff4e7d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393779/normal_5fe0fbf489861.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413575/normal_6006e6a1c0a90.pdfIn PDF document text
    • https://nijusalelazi.weebly.com/uploads/1/3/4/8/134875584/01d8aa8d2703.pdfIn PDF document text
    • https://pufoxedoj.weebly.com/uploads/1/3/4/4/134438994/dukosirixijisopik.pdfIn PDF document text
    • https://sosubewuwebefa.weebly.com/uploads/1/3/4/3/134360265/pefiru-zegonakiluvame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481420/normal_6029656125d67.pdfIn PDF document text
    • https://zigafofidonid.weebly.com/uploads/1/3/4/5/134508062/xaxopuzoziki.pdfIn PDF document text
    • https://vawuwoteb.weebly.com/uploads/1/3/0/9/130969488/najowaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407057/normal_6032160349dc1.pdfIn PDF document text
    • https://vujafufitagizej.weebly.com/uploads/1/3/2/6/132696128/66c62.pdfIn PDF document text
    • https://jowavuzawevubab.weebly.com/uploads/1/3/2/3/132303017/3242075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411708/normal_5fd38524b8876.pdfIn PDF document text
    • https://pukibasobudez.weebly.com/uploads/1/3/1/3/131379944/bc999dfb.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/b65ae767-56ea-4da2-8c8a-ff02d4273a83/legally_blonde_jr_soundtrack_instrumental.pdfIn PDF document text
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_d35a04b27d7d414f893781c93e7d5382.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5407e11f-6ecf-4369-ad62-bdb41a7e3f12/81874938866.pdfIn PDF document text
    • http://bamasagure.epizy.com/zujivojuxide.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_5111764c6c874adf99cae45ad022998f.pdf?index=trueIn PDF document text
    • http://vomogowejupilu.rf.gd/19573664476.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_2b317ef3be544c1cbda8e4f727d1886c.pdf?index=trueIn PDF document text
    • http://gukerarewaf.epizy.com/spektrum_dx7_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a90f075-306a-41de-bd1f-370701dc6c87/segugel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/014d88da-cedd-41e2-94f9-bfeadf32158e/34476956383.pdfIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_9b68aae3804048fda99f74834fc0ad21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3baac33d-e967-496d-90bb-b9dc7566fea1/wd_my_cloud_ex2_ultra_8tb_review.pdfIn PDF document text
    • http://waxusumuguk.epizy.com/rimuzar.pdfIn PDF document text
    • https://02e0da19-eac5-4521-950b-4e410541bf1c.filesusr.com/ugd/516249_da0fc7945e5e4a018a1eb75ccda1d069.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_off00024da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24DA0 5372 bytes
SHA-256: 7a3f6f4fee17180e9c4cd11b57c1aaaa95530be34efbea5f8a0cd0cc84546bef
font_01_sfnt_off00025ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25FF8 12516 bytes
SHA-256: 3f2c097513d26741455a7979cfdfd2d8059c31304fb5611585b877cae939ca25

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