Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5c8443a7d1002b…

MALICIOUS

PDF

121.2 KB Created: 2020-12-15 16:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2c02b84cd50ca06ba66b50fc91d87f1c SHA-1: 7fc38830727427cac614718204da9828fea2bead SHA-256: 8e5c8443a7d1002bad01b1bf3f0bc25c1d04d6b090d5a2398ee9d3fe75dbd7ae
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including a critical alert for linking to known malicious redirector infrastructure. The embedded links, such as 'https://traffine.ru/123?utm_term=how+to+play+chase+the+ace', are designed to lead users to potentially harmful sites. The document's structure and link farm characteristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://traffine.ru/123?utm_term=how+to+play+chase+the+ace In PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/6833258.pdfIn PDF document text
    • https://kibolimu.weebly.com/uploads/1/3/4/8/134872751/fodum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495685/normal_5fb796705c544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f935c5dcd38a.pdfIn PDF document text
    • https://fefojaza.weebly.com/uploads/1/3/4/4/134480993/6e2fdc.pdfIn PDF document text
    • https://jewumuseporefi.weebly.com/uploads/1/3/4/5/134599703/durinunonariku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3d955718-df08-407b-a7bc-992e61dde759/qui_a_crit_l_ancien_testament.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc795b181fec009684301eb/t/5fcb7dd29cf56e0e8b123b1b/1607171539650/gilop.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/43979216336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5857e83f-3853-453e-bc83-159e3c86174e/fortnite_item_shop_tracker_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/398660cf-0fec-4e9c-902a-9317938143d3/sim_card_not_provisioned_android.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd8a92bbd740658005df2/t/5fcb6f6f33fb14715cbb69d2/1607167855749/bikelis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000190fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190FB 4716 bytes
SHA-256: fb787e010304fcd718a46fb23830bab7d96c1a24e09db5677b43f38403e299ba
font_01_sfnt_off0001a123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A123 12904 bytes
SHA-256: bf87190504153a669472f64d06394e11e264d736874b686162ce0d5bbee1c211
font_02_sfnt_off0001c9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9D4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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