Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66496b372cea5c2…

MALICIOUS

PDF

78.9 KB Created: 2021-05-16 15:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: eea8119ed944312e7d79f0165c71875a SHA-1: 489db321bb93860dc17ea17e55444e4573f9ed5d SHA-256: b66496b372cea5c2bb30dd7e720444329bb44a353e8bbee34c2dde00bbefb41d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external URLs, including one that masquerades as a printer installer. The presence of a link farm and the deceptive content suggest an attempt to redirect users to malicious sites for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=hp+deskjet+ink+advantage+2545+all-in-one+printer+installer PDF link annotation
    • https://cdn.sqhk.co/taviboku/HS4hihb/sector_14_faridabad_huda_market.pdfIn PDF document text
    • https://cdn.sqhk.co/surudije/ghgfEgf/90870378963.pdfIn PDF document text
    • https://cdn.sqhk.co/radulijezu/jgcgigd/sokukabuke.pdfIn PDF document text
    • https://cdn.sqhk.co/bamosabubesi/jhdih4Q/degariguxerujaserise.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/jcujeje/rocket_royale_game_download.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/98692368403.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/ged_science_practice_test_free_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/grhhO4v/shooting_all_virus_virus_war_shooting_challenges.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/65516249922.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_4552f3599b2445b6b2bb63e6cfb51651.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_e56a1116fde54edbae68d88ca52b6bd0.pdf?index=trueIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_3319a74c2c8d40799831f8cc1a79d0d1.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_21fe96f5bde1443c8f3a398a185e7740.pdf?index=trueIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_693bc77e5fdd474aa12a8c65db63b511.pdf?index=trueIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_4415afd5802d48eb842f67cd0b0289f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/zilugeloki.pdfIn PDF document text
    • http://zijedan.atwebpages.com/23056289153.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_2a60c665c967464992eabf3cd4e07477.pdf?index=trueIn PDF document text
    • https://cd65756b-a9c7-4cca-9498-1747a6459195.filesusr.com/ugd/05eb20_d00897e9ad7546ed965da015bc6408c7.pdf?index=trueIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_01d9298cf54045c79bfb8c2f6b67b824.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/cfo_techniques.pdfIn 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_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 5664 bytes
SHA-256: 4732cce0f9cbe48657be4ed89fa9d1e95d3633cf1451f6961f02558081223262
font_01_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 11232 bytes
SHA-256: 0d40c1b2a5e5b726e1db419514a74079bbe6100f661013d649d1b120af5462b4