Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9252ce4ddc79a9…

MALICIOUS

PDF

67.9 KB Created: 2021-01-22 06:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 99cf1ad0a752c9368ea57d21fef96897 SHA-1: e1b7f7761bc4fdf4a3622b36089322b2a6bde937 SHA-256: ef9252ce4ddc79a94717a829dab9a111e99ce541652655c6262025ad240374c3
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggests a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly imply an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafffi.ru/aws?utm_term=hammurabi%2527+s+code+dbq+answer+key PDF link annotation
    • https://dijodiruji.weebly.com/uploads/1/3/4/0/134097483/rokej.pdfIn PDF document text
    • http://mijuxub.66ghz.com/xiwexujirip.pdfIn PDF document text
    • https://site-1172263.mozfiles.com/files/1172263/become_tour_guide_in_japan.pdfIn PDF document text
    • https://site-1173983.mozfiles.com/files/1173983/tedin.pdfIn PDF document text
    • https://senajadodum.weebly.com/uploads/1/3/1/3/131379015/9727814.pdfIn PDF document text
    • https://site-1179337.mozfiles.com/files/1179337/34383707054.pdfIn PDF document text
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/baruwag.pdfIn PDF document text
    • http://femokotafi.66ghz.com/jigefedegi.pdfIn PDF document text
    • https://site-1173625.mozfiles.com/files/1173625/xotelifej.pdfIn PDF document text
    • https://site-1166670.mozfiles.com/files/1166670/gafemiviza.pdfIn PDF document text
    • https://wobereresexo.weebly.com/uploads/1/3/1/6/131606335/xumagerajuwewiw.pdfIn PDF document text
    • https://site-1258356.mozfiles.com/files/1258356/hollywood_movie_tamil_masstamilan.pdfIn PDF document text
    • https://site-1168003.mozfiles.com/files/1168003/74664163516.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://besevinoferoza.epizy.com/ligorese.pdfIn PDF document text
    • http://donosusiligid.rf.gd/adaway_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/adobe_lightroom_presets_mobile.pdfIn PDF document text
    • http://bajofot.epizy.com/dedujuduvopusevuxizefe.pdfIn PDF document text
    • http://solepaf.epizy.com/bewirowupolite.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/54816370547.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/agile_testing_book.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/bobbin_lace_beginners_guide.pdfIn PDF document text
    • http://pawutewitozi.epizy.com/building_tower_wallpaper.pdfIn PDF document text
    • http://puzasapexuwuju.epizy.com/34713302569.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC139 5376 bytes
SHA-256: 06ea0d0444c77435f4254a0cb50c3eae2337feb57dda0d4002b8980ac34043b4
font_01_sfnt_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 9496 bytes
SHA-256: 4842a9bc59ffb99ddc486d7110e5f4116f46a505a60b98c11b308f47fb82f00b
font_02_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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