Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2404f7a267ab36…

MALICIOUS

PDF

73.3 KB Created: 2021-01-20 20:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 179a293d6b61a87e2f916136d15ee811 SHA-1: c8244ee9fae32dad0eb3e0a4d69973977c83f925 SHA-256: 8d2404f7a267ab368ec6a3030afed9fc9a1dc9990fea92aaf360b807e9d70858
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a prominent one pointing to 'seumenha.ru', suggesting a redirection or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, reinforcing the phishing or malicious redirection theme.

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://seumenha.ru/wb?keyword=writing%20letters%20frog%20jump%20letter PDF link annotation
    • https://wovukevaz.weebly.com/uploads/1/3/4/5/134523328/9930849.pdfIn PDF document text
    • https://site-1173627.mozfiles.com/files/1173627/nezovimudig.pdfIn PDF document text
    • https://site-1248223.mozfiles.com/files/1248223/fowegapozebi.pdfIn PDF document text
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/dirovodirudapa.pdfIn PDF document text
    • https://famogapev.weebly.com/uploads/1/3/1/6/131606489/sapat-nimetodukavon.pdfIn PDF document text
    • https://site-1251707.mozfiles.com/files/1251707/black_eyed_peas_shut_up_free.pdfIn PDF document text
    • https://site-1168375.mozfiles.com/files/1168375/28047053356.pdfIn PDF document text
    • https://gumevuwogixuxuj.weebly.com/uploads/1/3/5/3/135317748/264e155140cb.pdfIn PDF document text
    • https://site-1179658.mozfiles.com/files/1179658/carryon_my_wayward_son_mp4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f8882c757035.pdfIn PDF document text
    • http://wutoxurusot.iblogger.org/android_10_xiaomi_mi_mix_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://movafomuwexowix.epizy.com/zizafasujebuxusazujavavid.pdfIn PDF document text
    • http://suvumudupese.epizy.com/41265151705.pdfIn PDF document text
    • http://lejemerane.epizy.com/lopemigozejugugax.pdfIn PDF document text
    • http://jupuzagap.rf.gd/pevidogetuvuwigokusoper.pdfIn PDF document text
    • http://dazesokagevak.rf.gd/wexosoloduliku.pdfIn PDF document text
    • http://fokodema.epizy.com/accredo_prior_authorization_form_for_botox.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_off0000e28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 5100 bytes
SHA-256: c384330ba3bd7e3763d9b2950059b520d3dd003907230c80f31ee55858fbe00d
font_01_sfnt_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 10804 bytes
SHA-256: d3899f4258b7c8cc224c7664beb5992a6aa8282ed6800efc1cc9085900689b52

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