Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdabd88fc9455380…

MALICIOUS

PDF

69.8 KB Created: 2021-03-16 01:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8c104164fdbca2470caadf655dad9214 SHA-1: d529783097fa4266dc46965edabf635f0e62a103 SHA-256: fdabd88fc94553808606c8e8208b013a263c4889ca1c958d37e076bb638b1c17
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm designed for SEO manipulation. The primary malicious URL, 'https://xezojetit.ru/wix?keyword=words+that+begin+with+pre', is repeatedly referenced and appears to be an SEO redirector. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to search keywords, reinforcing the lure tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/wix?keyword=words+that+begin+with+pre PDF link annotation
    • https://jinimajaloxole.weebly.com/uploads/1/3/5/3/135314869/momabupetase-rupolevis-bizur.pdfIn PDF document text
    • http://ketoxitigojaluk.sportsontheweb.net/65072791963.pdfIn PDF document text
    • https://semufukat.weebly.com/uploads/1/3/1/8/131857602/surikasitibofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481527/normal_6041adba77228.pdfIn PDF document text
    • https://lututigit.weebly.com/uploads/1/3/5/3/135335707/6233282.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5fc98b2eb1bac.pdfIn PDF document text
    • https://sobuxiba.weebly.com/uploads/1/3/4/8/134867950/3830779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387566/normal_6019a3005591b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483338/normal_600bf43b55f80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477367/normal_5fe4dbe7566b9.pdfIn PDF document text
    • https://wilegefozuf.weebly.com/uploads/1/3/4/3/134399327/6764fec36687.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/wivalubiwal-kefutemagat-mutaji.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/fulazelof/the_dinosaur_museum_ielts_listening_answer.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_2d2f725e19ac42f4a2d2b2ea50cd94c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gavobawum/kedamuzumora.pdfIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_b4477453b6c649ec86c2e0aafa166c12.pdf?index=trueIn PDF document text
    • http://zijedan.atwebpages.com/soccer_drills_for_2-4_year_olds.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/constitution_scavenger_hunt_answer_key_american_government.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/docker_rpm_centos_6.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_04925f1b0ac0479fbceaf5b6f3a717e0.pdf?index=trueIn PDF document text
    • http://nujilexulajuwup.atwebpages.com/57039777216.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/application_form_templates_word_free.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_off0000d357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD357 5432 bytes
SHA-256: ff3b066ebe5f6f42d4feca9533cc8cb66b494e0989e6dd6385e454c0f42cfaec
font_01_sfnt_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 10556 bytes
SHA-256: 5221c902b6bde0507e191d6ab5a68145054cffb75a8fc8d5434e648d725b0e40