Malicious PDF — malware analysis report

Static analysis result for SHA-256 652631e5fcd1df04…

MALICIOUS

PDF

71.6 KB Created: 2020-11-11 03:11:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2d4936c8716d195fa0c38c292c3ee8c4 SHA-1: 9c8d7f0acb6b685f07e8e00b017b69c5739af8f5 SHA-256: 652631e5fcd1df04d43d39b131de3dff70189256aa3315b4502471dcb8e90de1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous URLs strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafftec.ru/aws?keyword=wood+picnic+table+with+detached+benches PDF link annotation
    • https://goneludolazoga.weebly.com/uploads/1/3/4/4/134488647/ed61d.pdfIn PDF document text
    • https://kufesolujuxubi.weebly.com/uploads/1/3/4/3/134373324/dakalivam_juvoxatafevok_zagesuz.pdfIn PDF document text
    • https://sifixibufe.weebly.com/uploads/1/3/4/3/134348909/nuwota-jurek-mobofapogopetu.pdfIn PDF document text
    • https://kavanezeso.weebly.com/uploads/1/3/4/4/134477356/levekidake_kowikodebira.pdfIn PDF document text
    • https://dinelelulom.weebly.com/uploads/1/3/4/3/134308509/pukapofafeto.pdfIn PDF document text
    • https://nibobesexetew.weebly.com/uploads/1/3/4/2/134266191/mugafijup.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/xovekolamoxe/google_drive_aladdin_2019_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a5b24bb-f414-4dab-a171-6a8892de78c3/an_introduction_to_discourse_analysis_theory_and_method_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/216e79c8-86be-4a17-ad6c-484de81b12e6/jigifusaxupanudokonikiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b26dbc8-c27d-44d3-b376-d2c3fcacac52/dapedafatitaxumujobobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe30e052-4083-44d5-8dea-da42a4b37559/47575287296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f6651a1-58e5-47b4-9138-91e52eb981c2/nefedowerifavadado.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/nutiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31126f7d-93dc-4cf4-9ba9-9aaaa4d8e140/mutant_chronicles_rpg_3rd_edition_pd.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_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 5308 bytes
SHA-256: 9fac4e8d807c981b080168edc0e622fef9d74b06a3fb25ab0846d4dbffcfd508
font_01_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 10796 bytes
SHA-256: 8e09f8e57a04f40a37a1d4d9fd549eeb8e0a3b1eccc09c95d7bc321a7d0a354f

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