Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb9b35012481657…

MALICIOUS

PDF

75.2 KB Created: 2021-04-06 20:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d9a8ba5f73b5c2f52ebedb295206e39d SHA-1: 371dec6893e6d02b91f7aedcdb490aff99ade6f5 SHA-256: bcb9b350124816576dc670d1bdd14473de4e5da8387f0b8310ca11c247d84aef
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. 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 7

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://crophysi.ru/123?utm_term=cmd+battery+report+windows+7 PDF link annotation
    • https://difodofixipa.weebly.com/uploads/1/3/0/8/130814112/2dd7b3ec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409806/normal_602937444b1d9.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/noposiwuxirije.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478414/normal_5feea2b6117f9.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/what_is_parthenogenesis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380413/normal_6041923e32080.pdfIn PDF document text
    • https://sowematawenuw.weebly.com/uploads/1/3/1/1/131164153/golama.pdfIn PDF document text
    • https://zutiwijutorezaz.weebly.com/uploads/1/3/4/3/134354078/4294063.pdfIn PDF document text
    • https://tofajoxoroj.weebly.com/uploads/1/3/1/6/131636991/1730802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413469/normal_602dcf40d8076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460980/normal_5fe6ecee670f4.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/josomadozofobefasane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_bd5de7ef052e43d78af6c58c8a5afa90.pdf?index=trueIn PDF document text
    • http://poduzamilikuki.rf.gd/anger_iceberg.pdfIn PDF document text
    • http://garapaf.epizy.com/xofojixotezux.pdfIn PDF document text
    • http://nazozogev.epizy.com/chinese_drama_subtitle_indonesia.pdfIn PDF document text
    • http://bepibuxel.epizy.com/97361038716.pdfIn PDF document text
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_2559230a5d4c4b54ba151eae6065334d.pdf?index=trueIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_ee8305d7de4642c6abe5ada9931648ad.pdf?index=trueIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_b42566d5263648ef8f24b95393da414b.pdf?index=trueIn PDF document text
    • http://kojexeruxub.epizy.com/gorerisimatelas.pdfIn PDF document text
    • https://ff5ab256-a407-4697-91b9-141751226614.filesusr.com/ugd/4205e4_c07854f5ab4741fcb41b0541605dbf02.pdf?index=trueIn PDF document text
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_4b9b55ece0424063b49b1768ab356e6a.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_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 5392 bytes
SHA-256: a72edd43a758d39d2f17eeb4f56a56613431065bee180919aca5b24a191c2772
font_01_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 11264 bytes
SHA-256: 22023040ca205d1ce7338b5447e733ae5c27e01a86ebb1c962bbfa6b506ec787