Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb66bc79f5166def…

MALICIOUS

PDF

90.0 KB Created: 2021-04-01 03:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 349da0427215e25c70f4b365585bbd0f SHA-1: c8eee847950f46a7a5ae4336924298e03f62faea SHA-256: fb66bc79f5166def5642fac3158c05ce55313a31687359c7213662cdc7fb742c
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, indicating a link farm or SEO spam campaign. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as a phishing trojan. The primary purpose appears to be redirecting users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=mike+winchell+baylor In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_602ebe587a20e.pdfIn PDF document text
    • https://pudajimerexinag.weebly.com/uploads/1/3/4/8/134896131/7df43b22d7fe7.pdfIn PDF document text
    • https://wapexuji.weebly.com/uploads/1/3/5/3/135329723/2e5ceaf77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421354/normal_6041f6ce83a58.pdfIn PDF document text
    • https://sazagirisama.weebly.com/uploads/1/3/4/5/134585928/nexumejusesuxip.pdfIn PDF document text
    • https://xajovulunama.weebly.com/uploads/1/3/4/0/134096198/6862f64f5e9.pdfIn PDF document text
    • https://kabosasano.weebly.com/uploads/1/3/5/3/135398154/vusuvenapebasima.pdfIn PDF document text
    • http://kufomabid.mywebcommunity.org/paradise_lost_book.pdfIn PDF document text
    • https://mediwamogapani.weebly.com/uploads/1/3/5/3/135318379/puzaderuwajujux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_6011d4cfa512b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_5fdbb57e251b2.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/gugarex.pdfIn PDF document text
    • https://cdn.sqhk.co/felolavap/3jcFhgu/bedroom_dresser_ideas_pinterest.pdfIn PDF document text
    • https://bobidowi.weebly.com/uploads/1/3/2/7/132740787/5890344.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/iChagid/muwolirerukasotuda.pdfIn PDF document text
    • https://cdn.sqhk.co/zidomirit/wjed7jh/the_trail_of_tears.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463002/normal_6015fedc05d76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nisetekotixob.myartsonline.com/gabezazurajalokuxusalaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/136dfb23-807f-450a-8d72-3ad50bd27149/clasificacion_de_los_numeros_decimal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3af20a21-9cd3-4be1-8579-1263c75eb24c/63800123401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac500ac-1975-4b08-a634-ee1ab9dda831/formula_for_equilateral_triangle_volume.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 5112 bytes
SHA-256: afc260beb231964bea0f5b23b4c3a540cc31ab7e5f659aa910d05ee5b9a4f59a
font_01_sfnt_off00012125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 10576 bytes
SHA-256: 5a75592969dacf2d440e8d90672f93ada03c70634462f572c9bb9815b9cb4d6a
font_02_sfnt_off0001455a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455A 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501