Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac508ddb8ae5cd8…

MALICIOUS

PDF

75.3 KB Created: 2021-04-07 10:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a789e8ec98f729b8e7a9f51c631433a1 SHA-1: 7f499cc8568d0b8996b1c966c930f515cbd21f6b SHA-256: 8ac508ddb8ae5cd85ab032bdc14a1aeb36ace0d185fa65fac283bca94fc909df
244 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to disposable domains and redirectors, indicating a link farm designed to distribute malicious content or phish users. The presence of a link to a known malicious redirector and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The document body, though heavily obfuscated, appears to be a lure related to technical support, aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+do+i+connect+my+wireless+joey+to+my+hopper In PDF document text
    • https://zofazozudu.weebly.com/uploads/1/3/0/7/130739697/5c530490.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/7f2aeeca6.pdfIn PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/jezivuvaj.pdfIn PDF document text
    • https://nofizosol.weebly.com/uploads/1/3/4/5/134500220/7076669.pdfIn PDF document text
    • https://mosugomepa.weebly.com/uploads/1/3/4/0/134096926/jafozuposi.pdfIn PDF document text
    • https://fikobovivinuzo.weebly.com/uploads/1/3/0/7/130739062/rapetap_betomagawodafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496204/normal_6051c391a51f7.pdfIn PDF document text
    • http://discount50.pro/xejasixarotipro0tm.pdfIn PDF document text
    • http://todayshop.website/kenmore_800_series_washer_repair_manual4upy8.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/jcPhcnb/mejedekimibonoduditar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421199/normal_5fee7236567ef.pdfIn PDF document text
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/9590660.pdfIn PDF document text
    • https://tonepadinaza.weebly.com/uploads/1/3/4/0/134017798/1813050.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/CjhlCja/35349788875.pdfIn PDF document text
    • http://justiciaforjustice.com/bearcat_bct15x_programming_cablea84gz.pdfIn PDF document text
    • http://usesol.xyz/best_bluetooth_scale_for_weight_watchers37t8s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zakamizorone.rf.gd/xirivele.pdfIn PDF document text
    • http://kuzezoma.epizy.com/moon_river_guitar_chords_in_c.pdfIn PDF document text
    • http://xevemifura.rf.gd/electrolyte_repletion_cheat_sheet.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_off0000e8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 5332 bytes
SHA-256: 08c189f2f8cf840163d8682d7b5475346b202850aab6766ff821d63aa2b62079
font_01_sfnt_off0000faba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 10820 bytes
SHA-256: 15584bc83925ab26545637f34acf605fdf81a540ba665edb61426ff4182a7c3a

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