Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a446948faacf3e…

MALICIOUS

PDF

101.6 KB Created: 2021-02-27 01:11:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f5f508e5a9ec88eed6f74c4432988a73 SHA-1: 334c378c08cdaa49528956ee85d91a6452a53a34 SHA-256: 31a446948faacf3e8a5eb700c2bdc97758e630f539d1b4750916f9a22c581214
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a suspicious domain ('midufefew.ru') and utilizing a 'utm_term' parameter that suggests a lure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of hosting numerous links on disposable domains, often used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://midufefew.ru/aws?utm_term=fledgling+octavia+butler+pdf+download PDF link annotation
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/zoviv.pdfIn PDF document text
    • https://litolojinoforiw.weebly.com/uploads/1/3/4/7/134721995/3237859.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/jipinilizalojiwogizut.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/323862.pdfIn PDF document text
    • http://vas-rem.ru/kervan_ilahisi_szleri_indirufzmy.pdfIn PDF document text
    • http://digitalmicroteter.xyz/super_mario_bros_2_theme_piano_sheet_musichg0lq.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/vita_di_galileo_b_brecht.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/how_do_you_reset_a_honeywell_thermostat.pdfIn PDF document text
    • http://ccckkkkk.space/self_determination_worksheets6bxtq.pdfIn PDF document text
    • https://bazeneta.weebly.com/uploads/1/3/0/8/130813787/1623736.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/82528231557.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/32731783148.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://kapirexazi.onlinewebshop.net/zigijuxowugorevosuso.pdfIn PDF document text
    • http://zaxalamel.rf.gd/dodupixogarogokuwobexikej.pdfIn PDF document text
    • http://wezojepodi.rf.gd/worksheet_of_conjunction_for_class_5th.pdfIn PDF document text
    • http://movuzog.rf.gd/how_to_answer_police_competency_questions.pdfIn PDF document text
    • http://salivokeru.epizy.com/matsec_examiners_report_2016.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFC 5392 bytes
SHA-256: 598bfab3057893cd8314028b44886826dca1c193a7af9de77cf56ed49372e385
font_01_sfnt_off00012d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D73 1852 bytes
SHA-256: cefa93ab99268b9387626336cc8aeb986d802f3a091f6156c231f0642977bfab
font_02_sfnt_off00013643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13643 5852 bytes
SHA-256: 070190071500e4e782f35bfd755afae89b66324ef3097a980fd68c75fb9893f1
font_03_sfnt_off000144fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FD 15944 bytes
SHA-256: ee02895dff8c4d323ce05c3d15ac62d9c9844f822054f83c62779fbdf48b6449
font_04_sfnt_off000172df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172DF 16064 bytes
SHA-256: 378ba5569bb666bbcf62f6b10ce7b1b17e3ec70dff13df96b0486da8cd924b4e