Malicious PDF — malware analysis report

Static analysis result for SHA-256 a263eaa77adc93a8…

MALICIOUS

PDF

69.6 KB Created: 2020-11-25 07:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d66f1cd1412aa1a1ede84495c787a4e5 SHA-1: da7906ed8656b9d8fdc9d786179abe3e8d8a2736 SHA-256: a263eaa77adc93a846817f7173cb61ed8f168cbc2d50af53af70e186b860e6e5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are to unrelated PDF documents, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=monogatari+chronological+order PDF link annotation
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/kedoxezezaj-temolej-zunemalavorun-mutelokowomimi.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/badekibilodo-rakajusazu.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/4b070bd5-bb34-43de-9e17-d5ff46b6cff5/31995451930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c4bb8d4-3e56-473c-8a88-b52437d21280/40580732247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07c35da-0c79-4d5b-9723-3c7e4e3d2108/global_door_closer_r7483_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dd49d5e-90f7-48d0-8863-ad1218493ca5/rowe_middle_school_chicago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/559ea611-a976-43d0-89d2-e53380d50dd1/39286017461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddbe7f80-cdf8-4dbf-b628-915b85b12b1d/43749886084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b5635e-f83e-4f6e-9d3c-19f3680e2923/adobe_flash_player_son_srm_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/altered_states_of_consciousness_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b4ce25a-2863-432f-9d91-b99335b18909/56535088247.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/lifetime_fitness_schaumburg_illinois.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f9cd85-3833-46de-a15e-c50fbe82b076/86944163771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/025ca856-8851-4c59-a104-7baabad6c24c/44408429939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/772dc1e8-6118-4729-b6ef-a37efe36e72c/9378091212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b208c1-fa6e-4dcc-9731-fec1895e13ab/pulsar_1200_watt_generator_manual.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_off0000d4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 5028 bytes
SHA-256: bfe21b0852a01cfbad45e92cefd7b10a9ef6a61f36382a990c9b38f1e9329789
font_01_sfnt_off0000e5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C8 10416 bytes
SHA-256: 5fabd329a27cef98c951a6f527e2a88b50cdcd632531e29ddc31380e90b77190

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