Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01ba81994168598…

MALICIOUS

PDF

68.7 KB Created: 2020-11-18 12:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3d92e6bf04e2f8842143063c65ab92f7 SHA-1: db954149346bee222d57482f1a37af1aefb5378f SHA-256: a01ba81994168598fbee66d96adb5618309ff5c32a4de9507460f0967082fd3d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used in SEO link farms to manipulate search engine rankings or to distribute malicious content. One of the primary links redirects to a known malicious domain, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

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://cctraff.ru/aws?utm_term=business+card+mockup+photoshop In PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/piforev_runipazalilip_jupaweko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412394/normal_5f97fd8982feb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5fa1426a27065.pdfIn PDF document text
    • https://jabiratunibi.weebly.com/uploads/1/3/2/6/132683422/vemasu_defizilatawog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5faaff2cabe5e.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/1a04680b-01bc-4f22-a711-9696edbbb3b3/42757760364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5708cde4-7006-48ae-8ce3-f911752588c7/do_birth_certificates_have_blood_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2210a10-884c-4c8c-88a7-f5318b0c073e/89766941756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/699bf8e1-c3a1-4ea5-9e93-3aa914cc63fc/3124320151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a1cb709-820e-412e-b0f3-7e94886b620d/wouldnt_it_be_loverly_grade_3_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44f35154-2c68-4a0e-9de5-8ab5e9ddb4bb/the_chemicals_between_us_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b793d4-e175-4bea-ade4-55c3101b01a1/jorubixiditokugatuvodoxem.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_off0000d1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AF 5392 bytes
SHA-256: 6c941845f64962b92ff4ab865d587707127bdbfd9f5ed025122a12deb8ce90a7
font_01_sfnt_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 10112 bytes
SHA-256: 94e2ad5083d9c61da530ca14322840c581ef125888cbfad904477abc10f9c39e

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