Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2852233dacf9d1…

MALICIOUS

PDF

78.2 KB Created: 2021-04-04 13:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2a2c45419ab438ae68d1f98c88904034 SHA-1: 808a6ac7827201bc259557f3ed6df05276f8037a SHA-256: 8f2852233dacf9d1630019ad36c1a48d038bc34322a9e03197abd7a892f5e884
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 0.9992

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://dugedepap.ru/aws?utm_term=how+to+reset+qcy+t8 PDF link annotation
    • https://xoxudepibedewem.weebly.com/uploads/1/3/5/3/135317482/85b7a9e9b616bf7.pdfIn PDF document text
    • https://pubategikosiw.weebly.com/uploads/1/3/4/1/134131453/9b69c8412b6.pdfIn PDF document text
    • https://nofawukamo.weebly.com/uploads/1/3/5/3/135347109/4114483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_6041f455ceea3.pdfIn PDF document text
    • https://zizipidefogin.weebly.com/uploads/1/3/4/8/134852386/nividag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483873/normal_60307914a589c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403822/normal_6060784155ab2.pdfIn PDF document text
    • https://fipowawebes.weebly.com/uploads/1/3/4/6/134601566/nazabavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_6045f71964267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_5fd09f87f34ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_c3015cab73464c44b8c18b1b5e00557c.pdf?index=trueIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_1d0289367e754ff58ad079bf4c5ab110.pdf?index=trueIn PDF document text
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_22254cab01234280a577996b994caf5d.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_a2915ed6e2ab494a97e93c08e4c74c10.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_d109d98ccd5d4c81a4e04312bed5b723.pdf?index=trueIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_e90d81ce740243a6bdbc6d2b352cfd9f.pdf?index=trueIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_5bba7e61bd3f4a77ba131b0af1cb7a46.pdf?index=trueIn PDF document text
    • https://1144d920-b655-460a-9e18-e2e21d63b765.filesusr.com/ugd/3283b0_f9ad12a11f0948cf9da3ced483a91c09.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_e47476aabf234fad8a06f0337fe8b005.pdf?index=trueIn PDF document text
    • https://b1d4f555-1eac-4d61-aa83-27206cf3ee4b.filesusr.com/ugd/1706f5_c44bc07181c34a4aa51002f34565a280.pdf?index=trueIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_0ebd0c01f7e64810a117550ce30c423a.pdf?index=trueIn PDF document text
    • https://a3abd3d7-f7e4-4b0c-86b7-ec358d8c805a.filesusr.com/ugd/97a3b3_a2807fb80b2d4cd4a502665085fdab38.pdf?index=trueIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_c1995227274d4716882265562bdcd244.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_46e0e7dd5f5c4d52837b5956cc0ed11a.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_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 5024 bytes
SHA-256: 9877b2863cc4a0c393fc4d8d453a4c6bf18666b942d36ff1dc7556f51a4266f8
font_01_sfnt_off000104b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B9 10916 bytes
SHA-256: 2627855d8639d0412b7c6982d665d85cc8bf54c70e6e582517b02c02929e4c1a