Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8166f72f454081d…

MALICIOUS

PDF

108.3 KB Created: 2021-03-25 01:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0bfe1b2bc532a866b6e8548fd88e7e48 SHA-1: fbfc8ead1dd3ec5c5b6e8103da54e3e6d72b3463 SHA-256: f8166f72f454081dbf197f1458234bfde3030b3df65286996628de64af8b6d10
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 0.9998

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://jumiwimov.ru/award?keyword=triple+bottom+line+concept+pdf PDF link annotation
    • http://yozi.store/pinewood_sector_f_codee1ci3.pdfIn PDF document text
    • http://nudistoff.club/82876202816ogdzw.pdfIn PDF document text
    • http://jigitozunawada.66ghz.com/87750585139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426416/normal_5fe8b7adbd0f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422912/normal_6045148173d28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469863/normal_605669f88f36d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_600dd2911a2e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467285/normal_5fcd0b09a2d61.pdfIn PDF document text
    • http://www.opentle.orgIn 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/0054cd5d-af14-47ca-a547-cabbf8b92cbb/human_anatomy_for_artists_the_elements_of_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e312a14e-2d0b-46dd-8163-dfb51993d8e3/honda_gx390_service_interval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be712d3a-08ef-4eee-bfca-9f6dac862979/fitbit_charge_manual_reset.pdfIn PDF document text
    • https://def05634-b969-4265-beeb-1e7d695e9a44.filesusr.com/ugd/6865ce_43f1e766ad9144c58ed202a4e4654eb4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23c98ad5-dff3-4dc1-9374-f74569c1494a/wekisexoxa.pdfIn PDF document text
    • http://telatojewoka.epizy.com/i_am_jazz_book_author.pdfIn PDF document text
    • http://keraxeberukin.epizy.com/29277806435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c967f8-3da7-4894-a539-0a81e57a38a8/6863811339.pdfIn PDF document text
    • http://bugigexomofi.rf.gd/how_to_start_my_victa_lawn_mower.pdfIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_d91f251a0fd449b1ac38959ecdedc500.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00014e11.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14E11 16528 bytes
SHA-256: d6552c4f8a33415d6e014ec6bb1ff94d6ee4cd092388aebf2d82ab7ba7caf9df
font_00_sfnt_off00013d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D32 5004 bytes
SHA-256: d6d065032736863a498da0b5c6370f29a9df199bd5d6c53ac6b069bb12f14473
font_02_sfnt_off00017b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B7D 11120 bytes
SHA-256: 0e47d7aca13f1b81e9d9017a5770bfd3a651c3485037c2a450d9e3a7fdbdbd82