Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d65a4def1e7301…

MALICIOUS

PDF

80.5 KB Created: 2021-03-13 21:24:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e5587cac40d01507a3a94028f8e7a998 SHA-1: 4713e2c8e443694fb4bb2dddee3d5aa2ddda1581 SHA-256: 15d65a4def1e7301822bc7ebafffd18806755d73ee2403ce2a88352131a8afdf
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 domains, suggesting a link farm or SEO manipulation tactic. The primary URL, https://dafemum.ru/strik?utm_term=robinair+34788ni+how+to+use, is likely a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=robinair+34788ni+how+to+use PDF link annotation
    • https://milikosepawina.weebly.com/uploads/1/3/2/6/132696406/bokiwuxo.pdfIn PDF document text
    • http://wefufivubulal.medianewsonline.com/fedutol.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/dudoxagekezebax_ragajin_zatubexenojon_tabekab.pdfIn PDF document text
    • https://wugizagopa.weebly.com/uploads/1/3/5/3/135311922/ropofapemew.pdfIn PDF document text
    • https://faworufobideped.weebly.com/uploads/1/3/2/6/132682851/bonir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501509/normal_5fc8badb643ed.pdfIn PDF document text
    • https://vofirojaj.weebly.com/uploads/1/3/1/6/131637635/5491851.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387424/normal_600731f22c547.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368235/normal_5fece9fabfc54.pdfIn PDF document text
    • http://kakorixow.mygamesonline.org/the_storm_kings_thunder.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_6ed8cdf88c574d6a9d4c5d9002b30f08.pdf?index=trueIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_375e84610dd340a9b92ea0556c265a69.pdf?index=trueIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_f399eeaa6f30486e847df8fa33a3ecbd.pdf?index=trueIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_0804aeb2158e47cf90a34ada88a7df77.pdf?index=trueIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_c87b8ceafc664fc2a45e38823a2a0448.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_164b071d21034d578532878949672a06.pdf?index=trueIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_9ad26bef24d14e0fb8770dc37a4dca47.pdf?index=trueIn PDF document text
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_a95d73e3da8c4963865c2773f5550816.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_062274ad11184dd3a64b9d422f907859.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_b49814ded66a46ff93e1b6833ee4c0c2.pdf?index=trueIn PDF document text
    • http://nuwadolonopip.onlinewebshop.net/22980245765.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 5508 bytes
SHA-256: 9451c30998b54848f225335c73ac890cd59fd2d38397f9a8da3064c13efd17b6
font_01_sfnt_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 11568 bytes
SHA-256: 60ee4650d8f689fd7ce5df082e80c2e9b9e0a5e40dfde745e0d0191389860378
font_02_sfnt_off000113ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AE 16120 bytes
SHA-256: df3d8d721a3c2b58f62fea9487c24aeb0e863bd34ec801b046293fa3c671fdb8
font_03_sfnt_off00012887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12887 2392 bytes
SHA-256: b4843b31a6fa3f6350fceebc3ce098749b3960e8234e8831d210718a5efd42fc

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