Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b0d5ebccc8b5ba…

MALICIOUS

PDF

72.2 KB Created: 2021-03-28 08:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 962e6b0bd4b388ecbb2eb72adc12c790 SHA-1: 90f7c5c5eb1f2680b0cb2155e9bfc3501e93f6b0 SHA-256: 28b0d5ebccc8b5ba15037ec919ba785283809c7cc5349028af41881d4adec2dc
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=hp+1102w+reset PDF link annotation
    • http://pedrons.space/8683334081u24tq.pdfIn PDF document text
    • http://1green.space/diaper_genie_elite_25ma3c.pdfIn PDF document text
    • http://smartbright.club/fabizebefapgnlc.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/6806f7a6-ccd6-4b7a-95e6-24f42ebc0123/72973960782.pdfIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_e5903844b2d24cf8ba3b36de1cffa5e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/409ab72d-bd77-4af7-8c58-4c3c1192d2fe/examples_of_domino_theory_of_accident_causation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ffad8df-dd00-41d9-a83f-ad74e08dc64e/strongs_concordance_hebrew_2026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a43190d9-f021-4fb8-af09-4f054fc01cb5/denokuxiwafobovubuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dfdc9f3-9b21-4cec-a4cd-93d8850e78cf/hp_3210_no_scan_options.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49453c15-f7e4-4d4d-9270-cdba1f7b5c40/76316494066.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_84acbf7e8c654c0d8ac8c652ce745ac2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0123a16-87f5-40fe-ae43-c3eecdd70caa/tijinomadoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f4396b-e941-45a4-b131-9c31267e39b4/12181704189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c589d74d-de42-4984-a934-209912444a24/82487059468.pdfIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_77da088407ff4851b74905f4df84568c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f250ac9c-f736-4f0a-b925-fe62195485fe/ar_15_parts_diagram_mat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3fc08f6-ed7d-4aef-919f-8ccf7bca8f8b/24969867432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00424701-9619-481e-9cf2-a7b4cd84a1ef/is_red_rising_worth_reading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac697be-0864-45c0-b49d-4c8ed5b570bc/top_baby_names_2020_australia_mccrindle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a22dfa5-6bc2-4ac7-bcff-22bd1327066b/29307012780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75353b18-9477-406d-92c7-148562807c26/how_to_prove_it_a_structured_approach_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338fcc2b-e3db-4663-85ff-90b5216a0317/48403744283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1392e18-f9aa-44b7-8cab-2cc73130a0c7/sonej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db14ef2-0f19-4fbe-b896-d99af7de192a/what_should_a_college_admission_essay_look_like.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_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 4948 bytes
SHA-256: 76d4d781dbae229c5c90a3f633cf6a54be0cc1f48e6a24b4d578bafeb8bdcce1
font_01_sfnt_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 12560 bytes
SHA-256: 1266099eb93788e5b1cac4bbb8caa6002faa77873cdaaef32fad3d68c897c08e