Malicious PDF — malware analysis report

Static analysis result for SHA-256 4783f87d72f09e59…

MALICIOUS

PDF

85.2 KB Created: 2021-02-24 17:05:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 415473f4b41303f581457519f292e983 SHA-1: 3779959ce93b7768645e1d95d53b88b8e95aaf97 SHA-256: 4783f87d72f09e594114801776640b2002130be03a1a89113d6bd72a2afd0362
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a mass of external links, including a known malicious redirector at 'https://crophysi.ru/wb?keyword=el%20hombre%20mas%20rico%20de%20babilonia%20george%20hill%20pdf%20descargar', suggesting an attempt to direct users to harmful content. The document body is heavily obfuscated and unreadable, but the presence of numerous PDF links indicates a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/wb?keyword=el%20hombre%20mas%20rico%20de%20babilonia%20george%20hill%20pdf%20descargar In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_600cf33f6db0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381546/normal_5fc70ab0227c8.pdfIn PDF document text
    • https://kefubawivamati.weebly.com/uploads/1/3/5/3/135304753/mafiveruxorixemuk.pdfIn PDF document text
    • https://minojesifivu.weebly.com/uploads/1/3/4/8/134860027/ed760697310.pdfIn PDF document text
    • https://loratabupufedev.weebly.com/uploads/1/3/2/6/132695903/newit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_6034e2a25a360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_60165d99bb817.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369161/normal_5ff23ccc7b469.pdfIn PDF document text
    • https://sasopezanureje.weebly.com/uploads/1/3/4/6/134691995/nipezajejutilulubov.pdfIn PDF document text
    • https://daxokubazab.weebly.com/uploads/1/3/1/4/131406800/kepizibufafod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491439/normal_601b593401a9d.pdfIn PDF document text
    • https://mulononar.weebly.com/uploads/1/3/5/9/135959518/bd38e4941a50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378857/normal_5fe54f6b9e290.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/mejados/what_did_the_rabbits_symbolize_in_us.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/65032796574.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/97554947968.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/pewafukekimovekor.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/zezekipugofigozadapepov.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28B 5668 bytes
SHA-256: 9d5d1b132cb7fe67ae36538ef8f007e490565361692067cf271c5c708ce52dfb
font_01_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 4816 bytes
SHA-256: 74251761a3876e912fb0facac738d3fbed72070a906f3a2494e175028685b81b
font_02_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 12644 bytes
SHA-256: d9cae34a6143060ea4491f7ab21916a79b44afdf4c5c6f8c5bc78d739c993831
font_03_sfnt_off00013021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1

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