Malicious PDF — malware analysis report

Static analysis result for SHA-256 726956546df2accd…

MALICIOUS

PDF

73.8 KB Created: 2021-05-27 02:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0b6c4948df4ba93b106103659c9e8b6c SHA-1: 20e664c20cdc4db4a74e95fc576762d1e2d97f45 SHA-256: 726956546df2accd33f44814b7fbd3beac4b8aea365e57deb7677bedfcdfe451
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external resources, indicating a link farm designed to obscure malicious activity. One critical heuristic firing identified a link to known malicious redirector infrastructure, suggesting the document's primary purpose is to lead users to harmful websites. The ML classifier and ClamAV detection further support its malicious nature, classifying it as phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=stihl+rollomatic+e+mini+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4493917/normal_6068280670e01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_6015d7372bf74.pdfIn PDF document text
    • https://zunelejodimoje.weebly.com/uploads/1/3/4/5/134526095/buduje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_5fd2a6cf6b3e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_60447269a429d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452199/normal_5ffe84f5aa381.pdfIn PDF document text
    • https://wapojopaboxijok.weebly.com/uploads/1/3/4/7/134747084/6015200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_600af3d37e378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476273/normal_600b4c6dde326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473056/normal_60179b9a7daa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402740/normal_603edc930fb96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421210/normal_5fe6717e9bcb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_600e60c6d0a5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c2d1a4-2684-4b3d-a738-a6d99422e040/hp_probook_6560b_battery_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d8a576d-53e4-4dcc-948a-3c7b3ff3169b/62374269828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52ed75f-3f51-4d31-b5ab-aba2209c770e/66530795804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fd00cf5-ee63-49c7-8cd4-24c5292cbc5d/arris_tm502g_speed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6277e720-ba57-4dff-824f-5836474de40d/bernina_sewing_machine_repair_birmingham_al.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6716bf3-9e32-43c0-acbd-40aa85430bcc/91003930010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4281d573-2889-49fe-871a-93692e55699d/raxopabutiwad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9cc1ab6-5ee8-4e96-bf0a-5efbeb1450fd/forgotten_realms_campaign_setting_3.5_update.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_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 4964 bytes
SHA-256: 2c7be57a6316987b038d42378eaeee0d2140559917fd6095c4d3b97cfde8d0a8
font_01_sfnt_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 10768 bytes
SHA-256: 38d1d64d7d6673b3e63ae4022f1cf610543c83a2b95bdc17fbd20f29d85ee610

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