Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3a567b83f5adca…

MALICIOUS

PDF

73.5 KB Created: 2021-01-26 19:02:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 671c1974e95f7d58484381fa2d43b425 SHA-1: 8f9a3a3db614eb602921f73e66779b3a75cfd4b4 SHA-256: ce3a567b83f5adca66b8dd8fb8374880612d007eace3c951422da168d1c75bf8
284 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, including detections for malicious redirector links and a link farm. The document's content, despite being heavily obfuscated, suggests a lure to install a browser extension or update, a common social engineering tactic. The embedded URLs point to various disposable hosting services and a known malicious redirector, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=beep+codes+viewer In PDF document text
    • https://bevozuvegala.weebly.com/uploads/1/3/3/9/133999301/8758070.pdfIn PDF document text
    • https://wovigapugup.weebly.com/uploads/1/3/2/7/132710676/4490441.pdfIn PDF document text
    • https://jerupixudenaxi.weebly.com/uploads/1/3/1/4/131437293/7998738.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/ddfdb688e1c.pdfIn PDF document text
    • https://pudasebedizut.weebly.com/uploads/1/3/4/5/134587980/9879837.pdfIn PDF document text
    • http://hookup154.online/mamakijinumurodajejaragiswrksp.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/kikunazadukovuv.pdfIn PDF document text
    • https://jitipukojid.weebly.com/uploads/1/3/4/7/134707402/ginatadedafadu-pelenabifen.pdfIn PDF document text
    • https://fawewetipe.weebly.com/uploads/1/3/1/3/131379545/93414cf857c37.pdfIn PDF document text
    • https://powufekati.weebly.com/uploads/1/3/4/0/134012492/rediju.pdfIn PDF document text
    • https://vekatugid.weebly.com/uploads/1/3/4/5/134592715/vomorivak.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/hhngfid/italian_radio_classical_music.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/OHjiNQi/satewakulepi.pdfIn PDF document text
    • https://kexiberuvulom.weebly.com/uploads/1/3/1/4/131409574/jutetedufafuwonoru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kegovev/86589308394.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/dekegexufafu.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/zusuzan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 4628 bytes
SHA-256: b84c27a4499fcebfcf4fd7d9a6cc5eb1ab7f15290c5db32c8aa279c3b8546d6e
font_01_sfnt_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 10616 bytes
SHA-256: 3af4bfad20599f7e7ef551d5f9d0908d387c51000b49fdeab380e7f286a02b9a
font_02_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378