Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db0097f383fb8c7…

MALICIOUS

PDF

69.3 KB Created: 2021-03-09 15:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8f12356ea825e349148a905c80389aa5 SHA-1: 21260be6376c73644276565a2c8830b25d8c7dff SHA-256: 4db0097f383fb8c75270d3889d66db75555dba85a4d3a4f0d6df22e57a1e5007
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, indicating it functions as a link farm, likely to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier flagging strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6895

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bologen.ru/award?keyword=free+pdf+text+to+speech+reader+software PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495681/normal_5ff4db9d5f1fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389582/normal_5fedd6eb5c13f.pdfIn PDF document text
    • https://zuwadakake.weebly.com/uploads/1/3/4/6/134664894/6850265.pdfIn PDF document text
    • https://cdn.sqhk.co/xejexeremiso/gtgjNjc/zesasiwosigema.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/vijulafejegukav.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/what_to_do_when_markets_crash.pdfIn PDF document text
    • https://rikisefunem.weebly.com/uploads/1/3/5/3/135337995/dusiveb-fagovu-zutolidaxozuna-wokazuvenosovuw.pdfIn PDF document text
    • https://cdn.sqhk.co/gegatuzikat/Tb9hggZ/29107922937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_6011241cd9c8e.pdfIn PDF document text
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/vojoloxeveguf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489052/normal_5fd94b24941ab.pdfIn PDF document text
    • https://sefomaxezaniv.weebly.com/uploads/1/3/1/4/131483109/balozuz_mavejizutik_panokebujo_buvudeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448113/normal_5fe35eb6af0c0.pdfIn PDF document text
    • http://delinapod.mypressonline.com/vatubolafunivanemasi.pdfIn PDF document text
    • http://katipef.medianewsonline.com/apostrophe_paragraph_worksheet.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/how_to_get_evaluated_for_sleep_apnea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcc926fd-3165-46f7-aef0-316f307d4474/64157761198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b0b7843-6cbf-44ed-a13a-7454af504547/how_to_know_your_birth_star.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_f0d93c4487a745e284a8ebd18f5b618b.pdf?index=trueIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_1f8ca8f8fb5f429f8cb19f00b0e65fa6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d3ecbb8-5cde-4a2c-aa63-0237bb02e9d6/10658535568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/538877ed-ddd3-429a-bd4b-4c24276dc801/how_to_write_titles_in_ap_style.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_38994f1266134c7faabcba5c50146efb.pdf?index=trueIn PDF document text
    • http://rodedewezijore.atwebpages.com/if_giorno_was_in_part_6.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_b934b89ba9ec4790b23a02aa7b4e7e9c.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8E 5328 bytes
SHA-256: a05701260ab518c493c1fe1a872d057ba78b8fb197bffea088b3aa72df5cc3d1

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