Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e0f02f7e2e3825…

MALICIOUS

PDF

73.0 KB Created: 2021-02-15 07:23:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7bed7cac6d075a98018cb77fb6702ff3 SHA-1: b5cc1335c00e443e0066d50ecc0577139b6f8fc0 SHA-256: 36e0f02f7e2e38258935e5f4e1adb4b09ff74193bd652d25af0605a5844758dc
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 numerous external links, identified as a "link farm" by heuristics, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were directly extracted, the PDF structure and extensive external URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/aws?utm_term=airman%2527+s+information+manual+2016 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367643/normal_600fe5581a50a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446400/normal_601aaa395fd29.pdfIn PDF document text
    • http://purpless.vip/pexofixulijevibupejhxu6.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/hc7ACf5/zimolofezugibupimim.pdfIn PDF document text
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/mexifunap-zonapa-xefore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_5fd6e787ae0f6.pdfIn PDF document text
    • https://rajizoru.weebly.com/uploads/1/3/1/8/131856770/ff0cef47bf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_60140456cecfb.pdfIn PDF document text
    • https://cdn.sqhk.co/giruzegovu/aghv5ja/xujifufuxedotevobezogo.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxilumevo/hdgcIUK/zowekutir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn 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
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE29 5416 bytes
SHA-256: ed2612adc999d6c2cd704481b78edf17eaec3a23879cc18b0255eda42e3cce7b
font_01_sfnt_off0000e088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 8976 bytes
SHA-256: 2df30c64b97ccb2843abf29c5a8ff3ba720237445e9a583b0b2f07585fdb381c
font_02_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 10668 bytes
SHA-256: f966fe46f14d6abd36eea15d2277ba27342c00318f6f0437fe0923a19e5ae1c3

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