Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd57fa1dcc79768…

MALICIOUS

PDF

73.1 KB Created: 2020-11-20 20:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 70dd6cd61ca9ae77bb654b6b7972f37c SHA-1: 72cb76b2e88d11c047849098573532e03dce0430 SHA-256: ecd57fa1dcc797684a38e85412b7eec3197b7a510294ad8794832ea31f5561cc
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a malicious redirector link and a PDF link farm. The embedded URLs suggest an attempt to manipulate search engine results or redirect users to potentially harmful content. While no scripts were explicitly extracted, the nature of the link farm and redirector points towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffking.ru/123?utm_term=anime+ninja+girl+with+mask In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5f9e7432a58c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_5f901c4d18b86.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/7971455.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/kasatisi_vetetipedimix_pudulajelitu.pdfIn PDF document text
    • https://fipokotosa.weebly.com/uploads/1/3/4/5/134506619/8244695.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vojapu/monux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de5433b8-0a76-4477-8a1f-f45b37227f96/pobisutipavobasoruz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd468c1-593f-4919-8af3-c95d2ba792b4/zeladofovutusakavi.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/280664174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2bbe27f-a736-4fdc-ba63-38d85e3073a8/wugamujupibawitukinubaja.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/avast_premier_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/polaris_rzr_service_manual_download.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_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 5320 bytes
SHA-256: d1cc929c84bb82c56dee714737e9a313d455651f3995aeb1173a8e87743f67c6
font_01_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 11196 bytes
SHA-256: 08e6deda472facbff270906f396b9e000a5c8729d0d34b8aabd91d219b356617

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