Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ab5cd333e8ab50…

MALICIOUS

PDF

77.3 KB Created: 2020-11-13 08:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30d2987529d1bad4cb1cdceb4c07f5fb SHA-1: 52e912d481408f83ba12c008ef2c8ab750170dfc SHA-256: 88ab5cd333e8ab50d8815ca589a8838259fe894beccb60ea0b9bb846e2829e47
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains text related to earning coins, aligning with a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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?utm_term=how+to+earn+coins+in+toomics
    • https://fulafokowezoje.weebly.com/uploads/1/3/4/3/134384829/sisofinizex.pdf
    • https://taruzabob.weebly.com/uploads/1/3/4/4/134493447/ladodisabexifokeva.pdf
    • https://fumubesoxumus.weebly.com/uploads/1/3/4/4/134485348/1501041.pdf
    • https://kupasaxep.weebly.com/uploads/1/3/4/4/134432663/fb44d9c885.pdf
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/4589730.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/najubu/motifs_in_things_fall_apart.pdf
    • https://s3.amazonaws.com/dazinibonofobi/tangled_i_see_the_light_sheet_music.pdf
    • https://s3.amazonaws.com/mizeteb/26816348328.pdf
    • https://s3.amazonaws.com/gewisetug/kigitiresonite.pdf
    • https://s3.amazonaws.com/ninazarila/sokozusudubozegijemador.pdf
    • https://s3.amazonaws.com/divikufifir/kingroot_apk_in_uptodown.pdf
    • https://s3.amazonaws.com/jukezeluf/sesimevuxutogibedep.pdf
    • https://uploads.strikinglycdn.com/files/c37f27af-d153-44d3-946b-e1615a8ad3c5/oakland_military_institute_principal.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_off0000e5bc.bin
f5d59eaa4ebafc4c8bf050662cf23afdf74fad3a3940262fc20d4f760a359168
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BC 4756 bytes
font_01_sfnt_off0000f5cc.bin
32f1e513c4554047e5a2b94374c051068cbb54398aa3725e9db85328946fbdf7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 10592 bytes
font_02_sfnt_off000119f3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 4324 bytes