Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc2a1e7a6d9b8b4…

MALICIOUS

PDF

72.5 KB Created: 2021-02-18 12:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: dd498cc1928cc928069eb4dcb5d3b92d SHA-1: 5a5a705b633d35c0bbb410dc6f95e4f4159977cf SHA-256: fdc2a1e7a6d9b8b453e8f1c768db8cc8666430120bd50cfb6ee27046de4e1578
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a large number of links to external websites, many of which are hosted on disposable domains or known malicious redirectors. The document body, though obfuscated, appears to be a lure related to common troubleshooting queries, likely intended to trick users into clicking malicious links. The ML classifier strongly indicates malicious intent, and the presence of numerous links to potentially harmful sites supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://yafferge.ru/strik?utm_term=why+is+my+mini+fridge+freezer+not+working In PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/0a1ad9e.pdfIn PDF document text
    • https://nukivobiwej.weebly.com/uploads/1/3/4/0/134016752/4881889.pdfIn PDF document text
    • https://katabeguravaka.weebly.com/uploads/1/3/1/4/131407194/7407155.pdfIn PDF document text
    • https://tifevijokob.weebly.com/uploads/1/3/5/3/135351552/fubazuwapijew_jukalukapak_sabiwifura_guzimesem.pdfIn PDF document text
    • http://septiki-rf.website/banenasujwkzpr.pdfIn PDF document text
    • https://pabixiwirixe.weebly.com/uploads/1/3/1/0/131071256/f0cd0c7dbdc178.pdfIn PDF document text
    • https://nadenekaf.weebly.com/uploads/1/3/0/7/130739264/mopogapilezeselobaz.pdfIn PDF document text
    • http://glawerry.online/free_whatsapp_status_songs063q5.pdfIn PDF document text
    • http://slmit.space/sudisipiwedibabepajs2wf6.pdfIn PDF document text
    • https://wenibowefopari.weebly.com/uploads/1/3/0/8/130814001/xokotunel-jozuganubepar-xuxosujogizufop.pdfIn PDF document text
    • http://streichpack.online/6253078273zkuq0.pdfIn PDF document text
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/tinuxefofawan.pdfIn PDF document text
    • http://my-favshop.online/dubai_opera_guided_tourfcjq6.pdfIn PDF document text
    • http://ewop.space/24475595566oewaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jinelod.rf.gd/netbeans_java_mac.pdfIn PDF document text
    • http://supanofarex.epizy.com/josquin_des_prez_ave_maria_sheet_music.pdfIn PDF document text
    • http://zudozam.epizy.com/bobupinomivaxavatopewine.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_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 5400 bytes
SHA-256: e33abe081c4e58518d3f45327e922d36ac20d53607431aa020b4ec68123c1e2a
font_01_sfnt_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 10296 bytes
SHA-256: cbe77d1829d299e185fffd65b50da3a8afe262378139c9fae46be0f2ad7ad790

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