Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda95a0fa85421ad…

MALICIOUS

PDF

86.9 KB Created: 2021-03-20 00:33:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3db5e934f2f23243536b6308d0d698a1 SHA-1: 28798f73b095817dd8812945d3faad68909861d0 SHA-256: fda95a0fa85421ad406d610e27030e9baac985f107100c0a71fc97ac7442d09f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a large number of external links, suggesting a link farm or phishing attempt. The embedded URL https://crophysi.ru/123?utm_term=compass+direction+application is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crophysi.ru/123?utm_term=compass+direction+application
    • https://cdn-cms.f-static.net/uploads/4473432/normal_600fcb5b5b78d.pdf
    • https://cdn-cms.f-static.net/uploads/4446382/normal_60134e0ea9591.pdf
    • https://cdn.sqhk.co/sitopizol/Miaiihe/93974420414.pdf
    • https://static.s123-cdn-static.com/uploads/4384831/normal_5ff2e26530263.pdf
    • https://static.s123-cdn-static.com/uploads/4463287/normal_5ff1e0249295c.pdf
    • https://ripabefemedoge.weebly.com/uploads/1/3/4/3/134321398/3113157.pdf
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/vadoluwasevuk-tinulujogi-sigujapaxejuwe.pdf
    • https://cdn.sqhk.co/wadelovelo/qhhigid/hmrc_tax_calculator.pdf
    • https://sazavilekin.weebly.com/uploads/1/3/4/8/134851962/7255361.pdf
    • https://xumexutibivuw.weebly.com/uploads/1/3/2/6/132680998/82e9e7116f6.pdf
    • https://static.s123-cdn-static.com/uploads/4479675/normal_5fcedbf900484.pdf
    • https://cdn.sqhk.co/nobixapo/hif8Ejc/maliciously_destroy_a_doll.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kulinisokakewi/68517889757.pdf
    • https://s3.amazonaws.com/wizidimawag/which_version_of_inkscape_should_i_download_for_windows_10.pdf
    • https://s3.amazonaws.com/wifiduxezo/spray_and_pray_cheat_sheet_prestige.pdf
    • https://s3.amazonaws.com/vavejijitatofu/12510939917.pdf
    • https://s3.amazonaws.com/dudujopixejikug/baldurs_gate_dark_alliance_playstation_2.pdf
    • https://s3.amazonaws.com/veledabejufi/sofuziti.pdf
    • http://lexafuz.epizy.com/siken.pdf
    • http://roxeruteruda.epizy.com/rujanakemobenetetinuf.pdf
    • https://s3.amazonaws.com/xijalovelokolep/fasegusilizezugodu.pdf
    • https://s3.amazonaws.com/tesapibebujep/70063748233.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a8.bin
1f345fde2da3f31fcf6cbd3810118e8ed77886fab2d0feb1067b72af870b7833
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 5124 bytes
font_01_sfnt_off000111f0.bin
2d0e248bca425e0bde254a7ad6752a79b185b945b43f06a9926bc81bd81ee94c
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F0 11204 bytes
font_02_sfnt_off0001385b.bin
e06fba4164ac16c165214f5f4232651daafdc404a58c7e7d1ab12f636b0c6cc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1385B 16336 bytes