Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83dc4e3f42c2a26…

MALICIOUS

PDF

77.9 KB Created: 2020-11-10 17:31:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6eb3645d32e026f50bda91e8e566774f SHA-1: b3bf0c25782a37cb73be556a4415991c96f78a1a SHA-256: a83dc4e3f42c2a266f730f507a609727bca1148cc20a078b079fa9496d7a5de5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, suggesting a link farm or redirection scheme to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious intent, likely to direct users to further malicious sites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/123?keyword=soundarya+lahari+lyrics
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/basusefepi.pdf
    • https://dajetulanew.weebly.com/uploads/1/3/4/3/134309067/rumikovevod-nuwel-xukixedabugo.pdf
    • https://gajokemijibefe.weebly.com/uploads/1/3/4/4/134467094/rasanuwixexeneze.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/4106527.pdf
    • https://sanaxuruvumuvuk.weebly.com/uploads/1/3/1/4/131438582/jumobuwig-duribif-pawuviwex-sijafegor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fekazudabo/todadisijavisiw.pdf
    • https://s3.amazonaws.com/remuv/wufodubadememe.pdf
    • https://s3.amazonaws.com/sabegokek/kabawo.pdf
    • https://uploads.strikinglycdn.com/files/9dd8516c-ee2c-43d4-aa68-4e2f4db689a9/wawofejikakil.pdf
    • https://s3.amazonaws.com/lijopavexanuse/1415372132.pdf
    • https://s3.amazonaws.com/pazifetanegapu/15601082364.pdf
    • https://uploads.strikinglycdn.com/files/e443fe71-f0ad-49da-81f1-6c0fd5958856/vonudogeful.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e82a.bin
1157da9e5c9e930accdc063669d3a870c2663a4b710a1dcdbae596638fbd3799
pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 3572 bytes
font_01_sfnt_off0000f500.bin
4744c3fdef0c48d0811532efccfb83c3408293a585102ca58c3443b078e754f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 5232 bytes
font_02_sfnt_off000106c6.bin
3780e3ad933957ecaf1fa7c56d83064627c5a638f4c00ddf0632d7de9032bfed
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 12528 bytes