Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d347797a7d3f2d…

MALICIOUS

PDF

77.2 KB Created: 2021-03-14 14:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: fc9caf83dbcbcf757f5ee57f252530a9 SHA-1: 25131cf61b3685dc9eda35eebb00ff4f6dedd3ad SHA-256: 52d347797a7d3f2d86d510945ef1618fa796ca50455820f83b5b1f8a2c66081d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a mass of external links, with the primary malicious URL being https://pelibifir.ru/strik. The document body, though heavily obfuscated, appears to be a lure related to search terms, likely to trick users into clicking the malicious link.

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
  • 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://pelibifir.ru/strik?utm_term=what+is+a+good+word+for+energy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481291/normal_5fde4f1e62f1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418747/normal_5ff256eaa16d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445544/normal_5fedfee828baf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451945/normal_602a80fa30174.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420924/normal_5fcda071cf6fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480149/normal_5ff9636e26be8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_0f64300154864ca3b03ec02f1396d27b.pdf?index=trueIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_98ddf6cf24cd4a5e8182c814cfe1ce61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/amd_ryzen_1600_overclocking_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/160d80c7-a1c9-488b-b41f-c5dd58257d81/whats_another_word_for_day_after_tomorrow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/358ca643-a1b6-4fd7-a52f-31aa8e8ea16e/mekibe.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/kunesumilazawomonuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/357ae22e-901d-4083-a111-2864b25b567c/how_long_to_cook_pot_roast_in_farberware_pressure_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e482cf-e0ae-45ac-8265-f62a88a03142/what_is_special_service_usps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa12b01-46b7-4dc5-a47c-62a1e38d59ee/wagoviwamewavin.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/tarisovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f5ff761-c74a-4391-812e-10160fb86247/pevusovusesewigukimipewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa14eb35-1038-493f-a183-3c09d3f3899c/8031081070.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_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 5344 bytes
SHA-256: 72cc4944ca394668d1ddbe92f42bed348bd33cab4dc692625d244a2614877f7b
font_01_sfnt_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 11368 bytes
SHA-256: 4207147a976d04e97e3d58c663e37e376f8c547af71cd7b83baed9c8140868de

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