Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e30d803e320a74d…

MALICIOUS

PDF

73.8 KB Created: 2021-03-20 02:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a02f78c0284773a1b916154ec24e797 SHA-1: 765703d0c6c4990dcc48d2a12f4e5079a6f9c06d SHA-256: 3e30d803e320a74dbecc73d4ea6f88341cf115f0ddfcdc6d995dd875a5b1ed0e
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains numerous external links, including a link farm. The presence of 'javascript href absolute url' in the document body and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious websites, likely for phishing or SEO spam. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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-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://nipisod.ru/strik?utm_term=javascript+href+absolute+url
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/1c0b7af16f94.pdf
    • http://alania365.ru/haynes_repair_manual_for_2007_dodge_calibero2l8o.pdf
    • https://jikurufor.weebly.com/uploads/1/3/4/6/134613562/zalokaku_silifotij_lizitiwadesaba.pdf
    • https://muzezibabut.weebly.com/uploads/1/3/0/7/130739211/4445763.pdf
    • http://devgame.design/fezogaselugaxi4211g.pdf
    • https://nelurorinubix.weebly.com/uploads/1/3/1/3/131384252/pajiwete.pdf
    • http://freds.space/physical_science_book6xwir.pdf
    • http://fredo.bike/bebatawugolutezomosomajag4mumq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tokatefozude/squid_fishing_report_puget_sound.pdf
    • https://s3.amazonaws.com/mexavofezoxi/pawisatopub.pdf
    • https://uploads.strikinglycdn.com/files/2aca7f29-a8c0-4568-b28e-c200b51814f1/does_the_total_gym_work.pdf
    • https://s3.amazonaws.com/mejawiwomak/dujekejemenatelifawufabep.pdf
    • https://s3.amazonaws.com/zowibatev/44385936887.pdf
    • https://s3.amazonaws.com/telasebisu/wurarukofuw.pdf
    • https://s3.amazonaws.com/nitatotol/naledunaligatojivawi.pdf
    • https://s3.amazonaws.com/piwupevivotixi/acrobat_reader_8_italiano_free.pdf
    • https://s3.amazonaws.com/lorugipopuxe/bleacher_report_live_app_support.pdf
    • https://s3.amazonaws.com/lorugipopuxe/baixar_adobe_reader_baixaki.pdf
    • https://uploads.strikinglycdn.com/files/9e53a8a6-ae96-42ea-8ab6-366a825aa14e/55502813415.pdf
    • https://css-tricks.com/example/index
    • 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_off0000d2d4.bin
af8c862f6aa25c476fd0a36b57ea56189ccd868227e8c5432fe3776dae2779ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D4 5068 bytes
font_01_sfnt_off0000e425.bin
b91684a0d3997f9492953e191b065901584ac7608969434c4fe5360b47069509		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 12012 bytes
font_02_sfnt_off00010ba0.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA0 4324 bytes

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