Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e5c69e39f46ea1…

MALICIOUS

PDF

74.8 KB Created: 2021-05-28 12:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e43d3c61f0caa85f378b78d5f045b90b SHA-1: b417fe81e7c84384658ebb98ec00ff515309f818 SHA-256: 68e5c69e39f46ea1816d63ad78758e2f21c02489d2c7e9f7e2d09746fa9169b6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://cdn-cms.f-static.net/uploads/4464874/normal_6020a92c8cb2b.pdf In PDF document text
    • https://dozisinabi.weebly.com/uploads/1/3/4/6/134646642/2801470.pdfIn PDF document text
    • https://salubekera.weebly.com/uploads/1/3/2/7/132740515/nujogajarevefu.pdfIn PDF document text
    • https://laxukiwu.weebly.com/uploads/1/3/1/0/131070933/zudonevudewofiverow.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/bojobije.pdfIn PDF document text
    • https://duwesokele.weebly.com/uploads/1/3/1/6/131606866/lawawob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_6025991d183da.pdfIn PDF document text
    • https://sejirefado.weebly.com/uploads/1/3/4/6/134682993/5ca886c2b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5fe1cfd950638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448986/normal_6069b41dd53bc.pdfIn PDF document text
    • https://vipapesad.weebly.com/uploads/1/3/4/3/134369303/8660617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480162/normal_6026e6b49c74e.pdfIn PDF document text
    • https://gipegilut.weebly.com/uploads/1/3/4/6/134699389/goluzu_sefefagit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/mO-5lVq97NI/wb?keyword=what%20is%20the%20best%20diet%20plan%20to%20follow%20for%20weight%20lossPDF link annotation
    • https://uploads.strikinglycdn.com/files/1db0acdb-5dc6-4488-a72f-ee0255086e27/72151166830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c300e03c-b73d-42b4-ba8e-cf94d10f7749/dojowutazugilidudibira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99699b97-89a7-4164-b310-f39e77af2175/dell_t3500_cpu_cooler_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb9acb4-d948-408c-be5c-c232c3e69aee/how_to_set_up_voicemail_on_iphone_consumer_cellular.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0fff29e-05c9-4f49-a516-4ea5b59ea363/9088877755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af7c84b-05b5-4f52-a49c-8f0d9532b949/how_do_i_look_up_a_gmail_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c49955fb-8b21-4d75-8b7e-92ef891425d0/dirt_devil_power_stick_sd12530_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0456fe9-5d70-4d8a-9dab-e9a85be5dfbe/pioneer_vsx_1020_k_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d037376-cfae-4cad-a9c8-099c32cec35c/political_cartoon_articles_of_confederation.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_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 5548 bytes
SHA-256: 2d4c1d94ff9e816d86e0515216d09f7ab173e5b1052999f278d2992ed16872d7
font_01_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 11016 bytes
SHA-256: baa701cc733e8a877e61f22854d132b785db0f4e27665cc0c4188615c7bae5e6