Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6a20aea9b488f8…

MALICIOUS

PDF

69.4 KB Created: 2021-03-08 20:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2d60169b62cc6e2761269f20362d21a0 SHA-1: d165467af9b1a5b5fdf7716fa5dcaabf8997b643 SHA-256: 8a6a20aea9b488f8dd42c563eacbb78d9c069aab95f0358f798bcd8b9ec1430a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One prominent URL, https://golowaki.ru/aws?utm_term=dream+on+me+crib+style+657+instructions, is embedded within the document, likely serving as a lure for users to click through to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/aws?utm_term=dream+on+me+crib+style+657+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465125/normal_60278648d18bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466676/normal_600a3b8a4e18e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_600df43f4134e.pdfIn PDF document text
    • http://hargotel.xyz/research_paper_on_online_marketingas1nu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423699/normal_5fc8dadcabc66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_559924ae715645b0bccb3c87bd223707.pdf?index=trueIn PDF document text
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_46316870c74a4089a6cba714989d1ce8.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_29000b90dee74df5acc5c17f0cf035b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/640a0224-4205-4258-9cf5-329e4c40b2b0/how_do_i_fix_my_miele_vacuum_bag_holder.pdfIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_27c9d7573a6d41c6be2b4658ccbd4267.pdf?index=trueIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_f706dc6eb63a47c5a33bfaf52e354229.pdf?index=trueIn PDF document text
    • https://43a98339-0465-49d0-a416-8cef4780896f.filesusr.com/ugd/89258f_8438058269e6471b951bb08ec76928b1.pdf?index=trueIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_90d19099e98245448b82f50b62576035.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8439a6-106b-447d-8b05-a68fb1324707/72370132535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a32edf6-1f09-4e09-85b1-f287789040f5/machine_learning_engineer_jobs_melbourne.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_ca20caa065c441648c02837fed279c80.pdf?index=trueIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_4e86234d343f431fb652c40a5eda0bee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e268f9-5a67-430f-8a1e-565bf12bebe9/58304123673.pdfIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_f34b055a6d174d99b769fad3b9f83a8e.pdf?index=trueIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_636e2d8288394f1f819a03fc998b42f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f94151-57e2-413b-a025-84489bfd3fda/xoxegojogafetikiguwon.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_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 5544 bytes
SHA-256: da1da4a55b9c6dc78b5981296490f3cf7ab73753de24e5a8c60dd22e638d1097
font_01_sfnt_off0000e57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 10032 bytes
SHA-256: 59274762c6a142af55d9d8bf2c078bab114c0867adb6bc22945dbaface581aa9

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