Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f47b3e5db1538c…

MALICIOUS

PDF

82.0 KB Created: 2021-04-29 03:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 93b6201558d7fa9c1c7404377f272e7e SHA-1: 7281be81455335083d6c08cf61d7b39f2fc13a50 SHA-256: 27f47b3e5db1538c7602e5f0a034fbc290cf0e99165ff17958dfcfe1f49b7a81
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=the+tower+of+nero+release+date+australia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374979/normal_602c39e713e02.pdfIn PDF document text
    • https://tulelamesesixe.weebly.com/uploads/1/3/5/3/135321102/7106185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_602ed16e4b045.pdfIn PDF document text
    • https://ruzojewa.weebly.com/uploads/1/3/4/4/134437104/resijexidinepo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497695/normal_600221c93e3b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_601788871abc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473035/normal_600b90b22dca7.pdfIn PDF document text
    • https://sizeduxaginota.weebly.com/uploads/1/3/2/7/132712537/bikivutabod.pdfIn PDF document text
    • https://fomiradoxep.weebly.com/uploads/1/3/4/5/134512134/9917932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_6012f9f3a572e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456660/normal_600e5beba31f4.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/keripifevukadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496148/normal_606b50c6935f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496153/normal_6022dc6e18113.pdfIn PDF document text
    • https://jejofiwapo.weebly.com/uploads/1/3/5/3/135312812/6235811.pdfIn PDF document text
    • https://tuxedibuzi.weebly.com/uploads/1/3/5/3/135350702/5f532.pdfIn PDF document text
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/1476934.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_0c28f319279b4d0083a7a37805c53bf2.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_76e255a652914f2ca87b996410039bec.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_0d30f6dbc6294458b3d61e91d568fb62.pdf?index=trueIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_c381807e098e44278d6363ef60d70ea4.pdf?index=trueIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_b75f47133de04c47be2fcb5ce1e1698b.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_7a763e0bed20465aa5a537860dd78756.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_a4df3bd39b5745ecafdc3681ce536ad5.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_44e192ae8ac2430b8cdc15e410b98ef2.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_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 5036 bytes
SHA-256: 8dbdd9670380378e51470fae9acbc433589c1d5391bda050081e79140375d2cd
font_01_sfnt_off000115bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BC 10764 bytes
SHA-256: fb1a64fa9c868d397962313c8b6e72a8eea3cbcffe8d7da688d2ff8bc49b62f6