Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b37d0da79d3b29…

MALICIOUS

PDF

86.3 KB Created: 2021-02-12 15:47:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 02873a9cae47a9ce765a82a2890baa6b SHA-1: ef2fda2989ec78476af95f17a6fdcfb484267d8f SHA-256: d4b37d0da79d3b295581e45c7263dff81185c7039b0f443705529e913f7d84a7
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate the document is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded links strongly suggest a malicious intent to lead users to harmful sites.

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 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.
  • 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://crophysi.ru/wix?keyword=ffbe+mod+apk+global+2020 In PDF document text
    • https://pupuzufasu.weebly.com/uploads/1/3/4/7/134759867/vawubemidibal.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/faziwekelegapi-wimujejukipapu-mukuvokadis-disurazate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fenigubigona.epizy.com/fitness_programs_template.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/cat_and_dog_pictures.pdfIn PDF document text
    • http://vugikalijuboxo.epizy.com/berklee_performance_center_city_and_colour.pdfIn PDF document text
    • http://mubozezubudiz.rf.gd/sinesidavufixij.pdfIn PDF document text
    • http://kofipazefoleris.epizy.com/zosixotafuso.pdfIn PDF document text
    • http://watijosanowo.epizy.com/24175483894.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/ralirolixur.pdfIn PDF document text
    • http://fuvogixus.epizy.com/kovorizovategoto.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/7608397844.pdfIn PDF document text
    • http://fasedivi.rf.gd/20428414924.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/jetibixenumovifudovanixe.pdfIn PDF document text
    • http://lawazujazigefon.epizy.com/ambala_status_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/aoe_2_mac_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 7276 bytes
SHA-256: c2ddd2ea877d8d8b0e350b40b3aafb74d6c44a96a0e10b181d27a31a93ca50be
font_01_sfnt_off0001145b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145B 5520 bytes
SHA-256: 575deb2dcc6c22d08038e865392049caf79293bcb6ab5b0d0952a00d86018a24
font_02_sfnt_off00012717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12717 10764 bytes
SHA-256: 3248a80f720764f7ae14a8b454d67d9bc87cd1cb9cd0d0cee875fcfee76507e7

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