Malicious PDF — malware analysis report

Static analysis result for SHA-256 788e890638a26169…

MALICIOUS

PDF

63.5 KB Created: 2020-12-18 13:34:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c12738ff74abf8e778d6dcf7d6506ad5 SHA-1: 7b11caec417bc0058b237f745b958997ce8c4114 SHA-256: 788e890638a2616945eb61f7088c715d790889093e86cdda711de27d3524043a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or malicious redirection attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to 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
  • 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://traffmen.ru/aws?utm_term=chithi+na+koi+sandesh+song+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407998/normal_5faafe7265b36.pdfIn PDF document text
    • https://lisopivoxo.weebly.com/uploads/1/3/4/9/134901835/9883a28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374851/normal_5fcf764119d47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5fb3230417a73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411511/normal_5fbf109d406a6.pdfIn PDF document text
    • https://negorevir.weebly.com/uploads/1/3/4/4/134471844/rosijuro_rafudaxojaf_tutofogab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f9a69fcbcd2a.pdfIn PDF document text
    • https:///\/gaana.com\/lyrics\/chithi-na-koi-sandesh-6,video_url:,zoomit:0,premium_content:0,is_premium:0,preview_url:zero,rest_lev:0,rest_msg_free:zero,rest_msg_paid:zero,_e:0,rest_msg_free:zero,rest_msg_paid:zero,_e:0,rest_levIn PDF document text
    • https:///\/a10.gaanacdn.com\/images\/albums\/17\/296217\/crop_175x175_296217.jpg,albumartwork_large:https:\/\/a10.gaanacdn.com\/images\/albums\/17\/296217\/crop_175x175_296217.jpg,parental_warning:0,isSponsored:0,isAv_ad:0In 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/fbb7ac9f-aadc-41c6-bdbe-a2724fad605e/sumapifopiderigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3a33f0-6663-4b88-b0fe-20b2bcd75da5/41233824124.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/sawenadivudewadijigil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a8c56d5-fb30-4d7d-b442-f38be79e67fc/gamanakukobavoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c7eb32c-233c-4926-941b-a555391c710e/cognados_falsos_e_exemplos_de_antoni.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_off0000b9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C8 5104 bytes
SHA-256: f3c5c61654dbef2e9d22c04a80a34567248cbb8d58b5e1633816575ee7145097
font_01_sfnt_off0000cb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1B 11344 bytes
SHA-256: 98a491a7d53331b78a78121a2c05e65eaa992f9a102c4a7286eab14b07a37493

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