Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4317452ee0b5d7e…

MALICIOUS

PDF

74.0 KB Created: 2021-06-03 02:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d86b41090962993c8b4cb93406a8da9 SHA-1: 670f694cf58bdf45dbc3f6eebf940772bd65f093 SHA-256: f4317452ee0b5d7e801a1bc29457ff48c1ae7ecc3daed31d4528a5121fbcf3fc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a campaign to drive traffic to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/123?utm_term=clause+and+phrase+worksheets
    • https://cdn-cms.f-static.net/uploads/4495973/normal_5fd674fba9cec.pdf
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5fd64750c24da.pdf
    • https://static.s123-cdn-static.com/uploads/4451018/normal_5fdff68d88f8a.pdf
    • https://pudarafuweza.weebly.com/uploads/1/3/4/4/134479559/pumibafumugetev_napedago.pdf
    • https://dukalafaziwemum.weebly.com/uploads/1/3/4/7/134772398/f6e4557785817.pdf
    • https://static.s123-cdn-static.com/uploads/4449965/normal_5fddc52f90bf7.pdf
    • https://xebuvimujutil.weebly.com/uploads/1/3/6/0/136050287/doxozitanij.pdf
    • https://static.s123-cdn-static.com/uploads/4421939/normal_5fdf93040f24f.pdf
    • https://static.s123-cdn-static.com/uploads/4369343/normal_5fdebe90acdf1.pdf
    • https://cdn-cms.f-static.net/uploads/4481282/normal_6030ea13ca10d.pdf
    • https://cdn-cms.f-static.net/uploads/4469126/normal_6044674a1691e.pdf
    • https://cdn-cms.f-static.net/uploads/4450747/normal_603691a846057.pdf
    • https://tavimemake.weebly.com/uploads/1/3/7/5/137513296/kegud.pdf
    • https://static.s123-cdn-static.com/uploads/4373769/normal_5fe406785a047.pdf
    • https://wobifeda.weebly.com/uploads/1/3/1/0/131070490/zonemobopu.pdf
    • https://cdn-cms.f-static.net/uploads/4413457/normal_606e59624ef76.pdf
    • https://cdn-cms.f-static.net/uploads/4456121/normal_6025b0990aea8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://negovijalulu.pbworks.com/f/basic_algebra_worksheet_with_answer_key.pdf
    • http://vibasuvezuz.pbworks.com/f/is_john_deere_oil_synthetic.pdf
    • http://jifesepapo.pbworks.com/f/adobe_master_collection_cs6_serial_number_100_working.pdf
    • http://vazesuna.pbworks.com/f/zatezujasifujaw.pdf
    • http://werinenimuta.pbworks.com/w/file/fetch/144529929/19049146425.pdf
    • http://luwapoveduvi.pbworks.com/f/how_will_you_describe_sadness.pdf
    • http://rimikupababo.pbworks.com/f/xaguj.pdf
    • http://jobojifitin.pbworks.com/w/file/fetch/144452070/spotify_premium_free_apk_offline_mode.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e566.bin
c102b1a7b165f13d609bab321593bebc5f770c3ca6b4f1547543ba530bae9c59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 5108 bytes
font_01_sfnt_off0000f6c9.bin
1318f2ab3c8d8c56a930f639c5362800a3e1adb9d008fb843429938466f485d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 10484 bytes

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