Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56bbea5b43e64e6…

MALICIOUS

PDF

79.0 KB Created: 2021-02-23 07:06:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4e6bf67ee6873b8b01857ff8f80b0fee SHA-1: b57a729b5ab62b2d921cb7e1771710eaa55b36c8 SHA-256: c56bbea5b43e64e68f527f69bcfad337c9d2e0fb16e626cc771897186f04aebe
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically points to a phishing lure designed to redirect users to a malicious URL. While no scripts were extracted, the presence of embedded URLs and the overall detection suggest the document is part of a phishing campaign, likely using a social engineering pretext to trick users into clicking the link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=what+modems+are+compatible+with+optimum PDF link annotation
    • http://tuimag.ru/66394781861wq6lr.pdfIn PDF document text
    • http://mon-cmbretagne.best/69372677877bivxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459787/normal_5ff2f3a454fb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388065/normal_5fcb4d50771d8.pdfIn PDF document text
    • https://cdn.sqhk.co/zewesifadeka/hcGhhhd/88900934487.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495244/normal_5ff879c5764fd.pdfIn PDF document text
    • https://cdn.sqhk.co/kusedesomawa/cggPKha/69525734371.pdfIn PDF document text
    • http://litesunaju.iblogger.org/15443287799.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/podawakumepewez/luxigefok.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/nogewudebefuniwoden.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/all_modern_makai_platform_bed.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/79588889965.pdfIn PDF document text
    • http://denakisewir.epizy.com/pusogajosopewofusafafuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/82442453634.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/jadivovezawawedovaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/19578952517.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 6812 bytes
SHA-256: 705a40f2f1299da93398ac562f39fb8e280a7b0d058145836d6dafd55d8ad212
font_01_sfnt_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 5556 bytes
SHA-256: ff55c18f4a3b417ba2916556a77b53f14b3d64efb20fb34ea2c367da7a644e8a
font_02_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 11296 bytes
SHA-256: 435a0c940542dbe082459b54ddbf27139bab0e07924f1a0d2fcc581d859d7584

Open this report in the interactive analyzer, or submit your own file for analysis.