Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd910c23e59fed5a…

MALICIOUS

PDF

74.9 KB Created: 2021-02-25 01:06:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4f6fc51f989976e5484c9818ad4c90f2 SHA-1: c4ad451ecee1c5619f51b271416bd07f75fc1660 SHA-256: fd910c23e59fed5a62910b9c37939e518529ee8053f88b239c3b77b7a3304485
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which appear to be disposable. The heuristic PDF_SEO_LINK_FARM indicates this is a link farm, likely for SEO manipulation or to distribute further malicious content. One URL, https://yafferge.ru/aws?utm_term=why+is+my+samsung+dryer+not+drying+my+clothes, is flagged as a malicious redirector. The ML classifier and ClamAV also strongly indicate maliciousness.

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://yafferge.ru/aws?utm_term=why+is+my+samsung+dryer+not+drying+my+clothes In PDF document text
    • http://itravelgr.com/sasanibinewitunebupoz6om44.pdfIn PDF document text
    • http://lishop.site/18224491976u73tn.pdfIn PDF document text
    • https://cdn.sqhk.co/jivomawufem/Eggdwgi/whispering_angel_rose_2018_tech_sheet.pdfIn PDF document text
    • https://rekazisiw.weebly.com/uploads/1/3/0/8/130874265/2779307.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/gp47qjg/codashop_mobile_legends_malaysia.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/7tfIha4/dusozun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486778/normal_6008690061b8e.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/jeOPjji/34360906446.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/90950404461zkkws.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/gLgGhjd/ragawajekowumivewade.pdfIn PDF document text
    • https://luvagifewu.weebly.com/uploads/1/3/4/7/134766249/xagafodumufurujakur.pdfIn PDF document text
    • http://lnstagram-office.com/complementary_and_supplementary_angles_worksheet_kuta_answersy3vyc.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/ih5I85E/gobisovonilej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413735/normal_5ff64e5a0497f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 5468 bytes
SHA-256: cec17326633f43011533e70f8b9a51a38887af7f26ac120516b74eb250a56a43
font_01_sfnt_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 10852 bytes
SHA-256: afe1228242adb34e46c925e7913c43692870f0bef739348a5d215f7bd1fefa6d

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