Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4a2b17c2f057a3…

MALICIOUS

PDF

63.4 KB Created: 2020-12-25 06:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 807b3e0cef418e9376414125ab72952a SHA-1: 95c21d2f08ab96cbf8ea3e68c74ca1fd8d07b86d SHA-256: 5b4a2b17c2f057a308671aff67abbac80c586cac49d4386a803574841ede8239
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, indicative of a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious sites, potentially for further exploitation or credential harvesting.

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://traffking.ru/123?utm_term=mighty+mule+360+keypad+manual PDF link annotation
    • https://neriborotarisim.weebly.com/uploads/1/3/4/3/134345051/lafelamufu.pdfIn PDF document text
    • https://cdn.sqhk.co/terexugureto/bifuidS/puppy_dog_full_hd_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/mewidexe/ciexeig/13812460719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5f887bb941973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_5fd853c3427a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426955/normal_5fdc7de27b4c0.pdfIn PDF document text
    • https://cdn.sqhk.co/dadakafopina/GjZ0Rij/musically_inclined_in_a_sentence.pdfIn PDF document text
    • https://gajinuware.weebly.com/uploads/1/3/4/5/134597963/d8bd98.pdfIn PDF document text
    • https://cdn.sqhk.co/tewisifupib/chjgdEw/vstep_ship_simulator_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447276/normal_5fcb043be1751.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/niporofez/atma_vidya_vilasam_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/dota_2_item_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/34707002456.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/xasopakusufovafoxesozu.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_off0000ba57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA57 5732 bytes
SHA-256: 3572e3b481f2a18f31602ed73743a8e817f65e143c257c084254dc07ee5e3ca6
font_01_sfnt_off0000cdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC9 9848 bytes
SHA-256: f8144ab5af79d78a443eb38e75a569e4dbd8fb63743a380428cf0cf5cad54077

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