Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c90333a1ddec5b…

MALICIOUS

PDF

77.5 KB Created: 2021-03-23 20:26:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9c80aef4a5e2c7863b71fb24813a8e3 SHA-1: 24ed94d78af4020bf36ebdae08919d9f0b1119e6 SHA-256: 19c90333a1ddec5b82fd6d9996099ee5c441277f9048ccc6510f3dd26a265479
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic firing with 30 links. One of the primary external URIs points to 'https://lozipotod.ru/award?keyword=workers+compensation+act+pdf'. The ClamAV detection and ML classifier also strongly suggest malicious intent, classifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure suggests a phishing or malicious content distribution attempt.

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://lozipotod.ru/award?keyword=workers+compensation+act+pdf
    • https://xowozasa.weebly.com/uploads/1/3/3/9/133999953/kexag-deligaf.pdf
    • https://cdn-cms.f-static.net/uploads/4411686/normal_602811917c199.pdf
    • http://joxixer.22web.org/40375026136.pdf
    • https://static.s123-cdn-static.com/uploads/4459479/normal_5fe1ebcb7f189.pdf
    • https://kabugumaka.weebly.com/uploads/1/3/6/0/136099465/kafupinijegawu_guwikumaz_zovuz_rasupinixi.pdf
    • https://puzubogo.weebly.com/uploads/1/3/1/0/131070381/xekesotivadim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://0ddd2631-58c7-464c-86d0-a5d1d8121c04.filesusr.com/ugd/301b85_5cd980c263ec4c93905e0f094e675afb.pdf?index=true
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_f90a5e3a8f524fc3bef78021d0f98d65.pdf?index=true
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_8d3c7b3652d2409990e985d22da49f95.pdf?index=true
    • https://s3.amazonaws.com/wenobagupexekap/35830379495.pdf
    • https://s3.amazonaws.com/firudegix/18652687310.pdf
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_6be58e727bfe4fc58f9dff5c028cc231.pdf?index=true
    • https://s3.amazonaws.com/vuzotisenixava/five_night_at_freddy_free_download_apk.pdf
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_42c94df30b704b388354ce80c42412ea.pdf?index=true
    • https://s3.amazonaws.com/liwafo/1324099285.pdf
    • http://savefativiluz.epizy.com/cyberpunk_2077_release_date_ps4_store.pdf
    • http://sezeludijufoma.epizy.com/81217216515.pdf
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_996d5b59626e429cba6e54ba37391ba2.pdf?index=true
    • 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_off0000e3b6.bin
821cb0cb03149e631515e4b0bdd268d6f18869781061f0c89ec395f4fce5b16d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 5132 bytes
font_01_sfnt_off0000f51c.bin
9ccf28759cccad426654aa14834cdd8fecd0c0bdfc1b65e687086b1aadd80c0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 10608 bytes
font_02_sfnt_off00011927.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 4324 bytes

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