Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a29862268a574e…

MALICIOUS

PDF

82.5 KB Created: 2021-03-18 23:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 50b5c14b4e858e8c9a91a3dd59dba7d9 SHA-1: b83b017979b4662d332fc0391c6656ecb0426382 SHA-256: f3a29862268a574edf5d7880d321f2cc62dbec9660966aa9eb4854c8ceafaad5
136 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDFs hosted on S3 buckets, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://jumiwimov.ru/strik?utm_term=pharmacy+technician+calculations+practice+problems', acts as a redirector to a malicious PDF. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://jumiwimov.ru/strik?utm_term=pharmacy+technician+calculations+practice+problems PDF link annotation
    • http://legumajati.22web.org/78593821805.pdfIn PDF document text
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/46177.pdfIn PDF document text
    • https://nalusopiko.weebly.com/uploads/1/3/3/9/133997408/venawewerod.pdfIn PDF document text
    • https://dibekojiworibo.weebly.com/uploads/1/3/1/6/131637919/43980f9d023.pdfIn PDF document text
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/6643122.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitatotol/bupidutu.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/73673288596.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/75301534658.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/christian_worship_music.pdfIn PDF document text
    • http://pizibajavodup.epizy.com/wavakeposamumepiluwozam.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/75111859586.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_2fe3887bbc514720ad6e60a3510e22bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/64173047514.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_29c3893fb77340b384bf607600be8bf9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luropiw/microsoft_outlook_2010_preview_handler.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/dewumelepuvozime.pdfIn PDF document text
    • http://suvoxezol.rf.gd/how_do_i_write_a_real_estate_purchase_agreement.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/11238676921.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/42570855333.pdfIn PDF document text
    • http://sunuwib.epizy.com/24305485704.pdfIn PDF document text
    • http://mazavenekixibu.rf.gd/export_text_messages_from_iphone_backup_to.pdfIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_54a2a14364cd42fc96d8b073267619ee.pdf?index=trueIn PDF document text
    • http://gezexibubaju.rf.gd/wiwupupiregijogutewevi.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_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 5416 bytes
SHA-256: f3f5bf7d4ab984e2a7898e76c1c155959901208c8d00a2e26c01c9d1560f3527
font_01_sfnt_off00011437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11437 11728 bytes
SHA-256: dcc22f1c338ec1c1f19badaf309fe518f1f04d917337d9c881720e2261676c47

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