Malicious PDF — malware analysis report

Static analysis result for SHA-256 284a176668a47c2f…

MALICIOUS

PDF

108.2 KB Created: 2021-03-09 18:48:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4bdab712e0c4decef5a5827b41ed9443 SHA-1: a84f18e62f2fe83b7f50926999622acd77e08b80 SHA-256: 284a176668a47c2f3f04547a8ef3c394fc70637d48ccf0c9c43281df402d007d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with critical heuristics indicating it links to known malicious redirector infrastructure and is part of a link farm on disposable hosting. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an intent to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://yafferge.ru/aws?utm_term=is+altered+carbon+on+netflix In PDF document text
    • http://tufuwavaziga.mygamesonline.org/what_is_the_average_salary_of_a_manufacturing_engineer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458428/normal_5fd6978203bf0.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/74001514017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_5fd82fd271275.pdfIn PDF document text
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/kurutoxizisevofowe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404730/normal_5fcf3bc08ebe0.pdfIn PDF document text
    • http://2220202.ru/bose_quietcomfort_25_headphones_manualfmb5i.pdfIn PDF document text
    • http://all-system7.xyz/vizefuworujimisidefuvd6u.pdfIn PDF document text
    • https://wegenagozej.weebly.com/uploads/1/3/5/3/135394478/jujagevuxokal.pdfIn PDF document text
    • http://mekuwomusaxonod.22web.org/2004_ford_focus_alternator_wiring_diagram.pdfIn PDF document text
    • http://mjawebdesign.net/58619962403kq2rz.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/93652995189.pdfIn PDF document text
    • http://gatokin.iblogger.org/50413812478.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/mukosenutibojotuzaxu.pdfIn PDF document text
    • http://tublitalia.space/define_computer_programming_and_exampleh1j7n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e2e1d2f-e5bc-406e-8ade-c93a3c5db6fe.filesusr.com/ugd/81c7be_aa07a8580d894e1e97cccb23f169fe93.pdf?index=trueIn PDF document text
    • http://fadakivok.rf.gd/hal_leonard_digital_sheet_music.pdfIn PDF document text
    • http://ralepixevoz.epizy.com/befesor.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_fcbf1bae62fb4f5a84c126f536cdc467.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_off00016920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16920 5160 bytes
SHA-256: 81df1a2e3bb6a1aca0c0eea199f19d106e92c7b521c1084be1a97225bb8ed8a0
font_01_sfnt_off00017abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ABE 12388 bytes
SHA-256: 8bad337fd94c18c1b7b029c0cb2718b5f6e9dbaae6aa7790b89c098c085f7b19

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