Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cc93c3c80aa783…

MALICIOUS

PDF

79.1 KB Created: 2021-03-17 19:15:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 513315cc511b16aeaca7bce509525e0f SHA-1: 2e7b1469a3ed8bb7204de6bbb498c35cdb21af83 SHA-256: 84cc93c3c80aa783d54f46a3589de1bd404fcd33df3add12a26d949417c70660
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://jacksth.ru/123?utm_term=bollywood+song++bestwap.+life PDF link annotation
    • https://kixixowagixu.weebly.com/uploads/1/3/2/7/132710794/debf3e6f92c400.pdfIn PDF document text
    • https://dunifavopugi.weebly.com/uploads/1/3/5/3/135312205/goxekukezudesotivo.pdfIn PDF document text
    • http://healthytrands.com/describe_the_infection_cyclefqgsn.pdfIn PDF document text
    • http://podipotekoi.ru/killer_keos_skimpy_cbbe_v2-v3_armor_replacer_ssefxsr6.pdfIn PDF document text
    • http://grenkasalo4.xyz/51669058252dq8n0.pdfIn PDF document text
    • https://sunivisoxeban.weebly.com/uploads/1/3/4/4/134493344/zuliw-figomebaf.pdfIn PDF document text
    • http://premial.su/how_to_count_by_7g2gii.pdfIn PDF document text
    • https://misapunuzure.weebly.com/uploads/1/3/1/6/131606411/larasekolozudor_bonuviretirunu_wozenib_kunuj.pdfIn PDF document text
    • https://xifekuvazunavel.weebly.com/uploads/1/3/4/7/134748582/74690f0c5e.pdfIn PDF document text
    • https://wagoburaf.weebly.com/uploads/1/3/4/5/134524365/c25a8abfd9a.pdfIn PDF document text
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/pekatenodo.pdfIn PDF document text
    • https://didejigoximatex.weebly.com/uploads/1/3/1/0/131070501/tilokibajikur.pdfIn PDF document text
    • https://devanuwi.weebly.com/uploads/1/3/0/9/130969177/f6850c0a6857741.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_0996bb0a747844eebe7660a954bc2b1c.pdf?index=trueIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_eb4f145e514448b99c8a77002c89305f.pdf?index=trueIn PDF document text
    • http://wumikexenuge.epizy.com/90319413101.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_ba10a8e0418c420a87c3488b94567782.pdf?index=trueIn PDF document text
    • http://suvowafavij.epizy.com/28626192242.pdfIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_1bd6ff2a5b13480fb905dba32919625e.pdf?index=trueIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_8fdf28f4ab714c38805d4c18430b2897.pdf?index=trueIn PDF document text
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_cf6aaf754e18483b93f90f61893d9e25.pdf?index=trueIn PDF document text
    • http://gigivixegaxun.epizy.com/16712273179.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_4f1ad31105894348995e1d58668af18d.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 5528 bytes
SHA-256: 58a13ae7835283bdb9457d4ab756d1748286690a088f4a16af43bc000fdc58c8
font_01_sfnt_off000107b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 11560 bytes
SHA-256: be641f9c86096f25877946f18173d82d8a4e0d5de732ec70349ee838f9669d7b