Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1a39bce1fbf1a1…

MALICIOUS

PDF

64.0 KB Created: 2021-02-21 21:10:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 216271a89dc8b954c4e333d4465e7e79 SHA-1: 2631a0c0d3af45dde34830d42fd6d3fc428f2ea1 SHA-256: fa1a39bce1fbf1a1b46ca0b8d2bab126c47b70e63caa7d7c099b000137b228a6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the document's structure and embedded URLs are indicative of a malicious redirection scheme.

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=uw+eau+claire+tv+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4454544/normal_5fced27a643a6.pdfIn PDF document text
    • http://rotelebi.22web.org/weather_report_in_mumbai_live.pdfIn PDF document text
    • http://gravkamen.ru/el_carmen_de_viboral_prepagos8irq0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_600b63ccc41bd.pdfIn PDF document text
    • https://cdn.sqhk.co/pibegufuxova/hIijmBA/42866611988.pdfIn PDF document text
    • http://cccckkkkkdd.space/top_synonyms_and_antonyms_listsdqjw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381551/normal_5fcb499308a18.pdfIn PDF document text
    • http://urott-hu.com/how_to_drain_lg_true_balance_washerm7xo5.pdfIn PDF document text
    • http://damvglaz1.xyz/fipufa76ej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491945/normal_5fdae63580b78.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/jScLjiI/viwikelegabakuduxipij.pdfIn PDF document text
    • http://freshnatur.fun/how_many_calories_in_dunkin_donuts_frozen_matcha_lattew3u5s.pdfIn PDF document text
    • https://cdn.sqhk.co/wefopijupe/cBFkhha/71436611206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_600a3ad76c0cf.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/igduggj/sonny_liston_adopted_son.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nujidurib.rf.gd/animation_movie_maker_software_free.pdfIn PDF document text
    • http://nigojelur.epizy.com/wanikifuxi.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_off0000bda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA8 5072 bytes
SHA-256: 28fa15fd1f2d75fb0629b6d2deba7b9fac0b9debfd00f6c870200ab05b9ad924
font_01_sfnt_off0000cf13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF13 10464 bytes
SHA-256: 4651fb913f1bafe399ae8065c0165cf01075235960b854b31b92fb7b62ed91f6

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