Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c74ac2dba74514…

MALICIOUS

PDF

75.6 KB Created: 2020-12-27 08:03:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b9af3a2d71599cd4eec4a7bd80674b73 SHA-1: 9258f8406a77ec57f33a72cd614a4d2183b6635d SHA-256: a5c74ac2dba74514e0fd3564d20e1f344c11d3c59912589e663fc0c3e1c8f994
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that directs users to a phishing page disguised as "Mental status exam questions and answers". The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting. No scripts were extracted, but the presence of an external URI is a primary indicator of compromise.

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
  • 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://trafffe.ru/aws?utm_term=mental+status+exam+questions+and+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366027/normal_5fc4a20687bc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_5fb2a76a02084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_5fb91317c4620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447447/normal_5fa6f3143de82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471464/normal_5fcbac58cbb59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379616/normal_5f8e2d71dbbe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_5fdc7b14f1d37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459326/normal_5fe22e6e733fc.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/537411f6-7577-4f19-b0be-e87b9d02d038/bharatiya_hindu_temple_clinic.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/39043614838.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/suriname_tv_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32bb9528-fecb-4887-bbea-60fe4c012d41/53796267518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efe4a9f3-20bd-4920-899e-a334092df261/fivibewatakene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e36ce94-b755-4bb8-8d93-e6fc7ce87258/mass_production_eva_chibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86db8d29-0f5f-429c-803d-e84f94b2ce7b/speed_rope_or_jump_rope.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 5260 bytes
SHA-256: 375d67881e06863a317a5a24b1e3646d500fafd501076f9c5428570b9629012a
font_01_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 10736 bytes
SHA-256: 546f2b1d09f9d234093c45e781f176a9d0cbd6d3fae1490b6536a237bcbfb40c

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