Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83e515c74d29039…

MALICIOUS

PDF

130.5 KB Created: 2021-02-22 19:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4efc430279abff6909989ef0731777d9 SHA-1: 205d3a692452c790ab37d6c314cbb939c0291768 SHA-256: a83e515c74d29039f6ce206e4278df64d2fb51212a1f5e0dcd8222279cf725a3
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a prominent one pointing to a redirector URL that ultimately leads to a PDF download. This behavior, combined with ClamAV detection and ML classification, strongly suggests a phishing or malware distribution scheme. The presence of embedded JavaScript, though not directly analyzed for specific actions, is often used in malicious PDFs to facilitate exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://bologen.ru/123?utm_term=woman+hollering+creek+quotes PDF link annotation
    • http://socialwave.me/zinimusibotepo2y44.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/jhxSiiq/pico_de_gallo_real_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387037/normal_60188560b1b7f.pdfIn PDF document text
    • https://cdn.sqhk.co/mumaxifup/igiaJdz/38249339756.pdfIn PDF document text
    • http://ctyr.ru/us_visa_interview_questions_b1_b2sf0vm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411479/normal_602a1c9d89c23.pdfIn PDF document text
    • https://cdn.sqhk.co/dutararopat/if5O9Fr/nifuliv.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/hogejaG/digital_marketing_certificate_course_in_usa.pdfIn PDF document text
    • https://pupiwukonavi.weebly.com/uploads/1/3/2/6/132682553/nixebuxasofosaxivexo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468814/normal_5ff655a54d5ea.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/hbVP0SG/black_hole_io.pdfIn PDF document text
    • https://cdn.sqhk.co/suwajipufo/fjjIDic/44546488298.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/dGCpjjL/k12_schools_online_school.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001c2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2FD 5416 bytes
SHA-256: e897be32c6d8fded5e2cf893fab7a6001f778bdef3ea4f3031a0a1c7e0032128
font_01_sfnt_off0001d544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D544 11844 bytes
SHA-256: 34eb4dc59d9c260a0369e59b295386b2eeb6412a3ca56772a4a08f5e57d36ca5

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