Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a1f71b552f30aa…

MALICIOUS

PDF

72.8 KB Created: 2020-11-24 12:17:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ee260447dacfc02fac0d319e70e0d38e SHA-1: dcea580eb92aaa3dca1c775cf4fedab10e3cf4af SHA-256: a7a1f71b552f30aa08387e88c00ffff67c7e699dd13ec95fe00a7dcde6e4371c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/strik?utm_term=download+osho+dynamic+meditation+mus In PDF document text
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/derupo.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/wubigonuja_kafutitudaruj_defelovorojiw_giguge.pdfIn 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/aa38e551-05c6-4991-8f43-15d14a6063d3/situaciones_de_aprendizaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d157a7-7d18-4d5b-8adf-aae88b068759/34227103799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d85361a-d069-4774-b11b-47358e253eb2/31142019492.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/46828938369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f844b7c0-827d-4fe0-af49-7d1dbdb008b1/jododexutum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e20268a-2a1f-41ba-9a27-5abea222df81/tesilewim.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/gamazifebibekinolodavi.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/greater_albany_public_schools_human_resources.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5a06200-dfe1-4ac2-afbb-bc285962feef/7504301933.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/graphing_calculator_radian_mode_online.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F0 5276 bytes
SHA-256: a1dd3e16b41f0671230ee111f76f4fbf1c881378b62936cdd977d6a0e179dc60
font_01_sfnt_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 11632 bytes
SHA-256: 62958ec21f3e898740ffe60898db2743fd24fffe697ba498113d923fcab74e86
font_02_sfnt_off00010184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10184 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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