Malicious PDF — malware analysis report

Static analysis result for SHA-256 58631cab62650bc2…

MALICIOUS

PDF

82.4 KB Created: 2021-05-19 02:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 72d9b58a8dea81cdf90a1351750fc37c SHA-1: 694576f96d39b0478cab807c9287297703dcd490 SHA-256: 58631cab62650bc251a3ea334fa031873598c1b5d44a29fc1f63ad9409081346
156 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 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=verbal+aptitude+test+questions+and+answers+pdf PDF link annotation
    • https://fitulepam.weebly.com/uploads/1/3/0/8/130874207/7611737.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403141/normal_5fe5a546a21a8.pdfIn PDF document text
    • https://dunofedipusafo.weebly.com/uploads/1/3/4/4/134477286/7690282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426815/normal_602a385e7d9c4.pdfIn PDF document text
    • https://nosovaranipad.weebly.com/uploads/1/3/4/7/134743093/88d838.pdfIn PDF document text
    • https://voganesabif.weebly.com/uploads/1/3/1/1/131163538/tijosetoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_605b1d4f29b52.pdfIn PDF document text
    • https://vuxuminitemup.weebly.com/uploads/1/3/0/8/130874085/399528.pdfIn 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/75723692-1f26-4988-b5a9-e37c131710cd/does_out_of_sight_out_of_mind_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de06860-0fc7-475d-9c2a-ce86337f4232/vavazinekojaxutufiw.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/gelawim.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/join_pak_navy_civilian_jobs_2020_batch_2021-a.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/what_does_contention_mean_in_information_technology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7255d35d-a14f-4287-8d27-d52bc1e98bb7/15633546232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/176e4808-ccfa-470f-a139-4493b4b4525a/japevetutifu.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/34260407945.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/how_to_open_waves_plugins_in_fl_studio.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 5360 bytes
SHA-256: c9095a1d79dddd9ef5662d903ed2b871bc30e13aac6cecd2a0cc04024693e9d0
font_01_sfnt_off00011877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11877 10560 bytes
SHA-256: 93402dd6f99dbb01b663c4167896b2545d74a709a7b1b4a0dfb4fd964c4a1cee