Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f8110c19bd8440…

MALICIOUS

PDF

73.5 KB Created: 2021-03-14 06:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: da4747067ee627bf84b68446d2b3b3a2 SHA-1: da926d428734c9fe500ebcfde273df6047b4087f SHA-256: e7f8110c19bd8440b526bc0b03f425d04fc2d78779336d684938a245c768de9a
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://gimoguvi.ru/wix?keyword=a+series+of+unfortunate+events+music PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487201/normal_5ffd0d7fa913b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_603ddd7d216c1.pdfIn PDF document text
    • https://cdn.sqhk.co/sabimejuka/fnmICGe/32743865352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_6028fae87dd92.pdfIn PDF document text
    • http://criticcxck.space/zyxel_c1100z_modem_review8cs0x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455377/normal_5fe230f9a90c4.pdfIn PDF document text
    • https://didegesub.weebly.com/uploads/1/3/2/6/132681352/2991731.pdfIn PDF document text
    • http://interplast.ru/photo_video_maker_free_download_apkdrin5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447097/normal_6008f8ed49ff3.pdfIn PDF document text
    • https://xeneniwavufew.weebly.com/uploads/1/3/2/8/132814439/jujadiwufegagevina.pdfIn PDF document text
    • https://luwozupewudaxu.weebly.com/uploads/1/3/1/3/131384663/238d2.pdfIn PDF document text
    • https://cdn.sqhk.co/firataxoworo/dhjjaFq/kewewipo.pdfIn PDF document text
    • http://persequenteamsohbet.com/funciones_del_area_de_alimentos_y_bebidas_de_un_hotelbp0kc.pdfIn PDF document text
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/vezilod-tokofuze-warinujoparimo.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/3icjihj/zoduxusid.pdfIn PDF document text
    • https://cdn.sqhk.co/zapevexuvot/jeQTIjs/warpath_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/chi5wmC/wabifor.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/napejaxosinages/torirekexuxojidi.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/classical_guitar_tabs_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 5044 bytes
SHA-256: 76e17c7c5785052b4911a0bafee9fca5dd597f9cf184c1eb5bb71ac5e71214ee
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 11368 bytes
SHA-256: bcbdba9223ba114ee9ca23d8e401bbfd88819cf0062fcf45cd2902427d157e1e

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