Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f962bd41aaca419…

MALICIOUS

PDF

82.4 KB Created: 2021-03-16 19:47:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f13cccd64c420c5590c0b55fb0411ae2 SHA-1: debcb54bd65a99012bc1ea0ea098655daa5ef9fb SHA-256: 7f962bd41aaca41964abb7c2fa0cca4137fcd8f9ee5511a61012e78c6c360df5
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDFs, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate that the document is designed to redirect users to potentially malicious sites. The primary redirector URL is https://baarspo.ru/123?utm_term=bhagavad+gita+chapter+18+in+english+pdf, which is likely used to host or redirect to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/123?utm_term=bhagavad+gita+chapter+18+in+english+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366348/normal_603d97d08bbcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493541/normal_604cc4e111d42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486197/normal_602ac96abd4b9.pdfIn PDF document text
    • http://sakajutapud.22web.org/tv_channels_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459058/normal_60317da841674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495973/normal_602b5f1097ceb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_a7285d89a8d943cc81becc7b208b5f4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/author_s_purpose_worksheets_5th_grade.pdfIn PDF document text
    • http://jixolekajes.rf.gd/1736919541.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/angularjs_format_number.pdfIn PDF document text
    • https://f0f855fd-29d2-4bf6-9fdd-af1de8d1f91d.filesusr.com/ugd/184831_ad58d3e8e675476aa0728dd944e21873.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/tegonutovebekegarogemigef.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/armored_core_4_answer_mission_tree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b340f41a-ed7c-4819-8b17-ee7632ee4331/letratag_100t_vs_100h.pdfIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_3e952e4592bb444f9215b8542d2d7af3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a589915d-f709-4309-b92b-2c522909b8e1/how_to_install_bosch_slimline_integrated_dishwasher.pdfIn PDF document text
    • http://povovudajax.rf.gd/65143272389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed2a1708-8824-46d7-b969-894015e8012a/dovilagubexejukukaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/529c3776-b28c-497e-b963-f32ceda10cfc/zobexupim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e75c85c6-bd5b-4b65-9307-0f85c3562041/nekuvoluzanoz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 5452 bytes
SHA-256: ba528516bd79565dfc3b535eb5ebc48c294529923137e8d4acbccb10f46c4866
font_01_sfnt_off00010b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4E 10136 bytes
SHA-256: e0e6c40a6c19f90c248920a06af76806aba552d6ba31b05416de1eeb50de4a4c
font_02_sfnt_off00012e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E05 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e