Malicious PDF — malware analysis report

Static analysis result for SHA-256 144eccaa0176d969…

MALICIOUS

PDF

84.2 KB Created: 2021-04-02 23:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8a661b516153bc524799f52097a0609a SHA-1: 89fdd8639b46a2e8f10418dd5c51478abd0b840e SHA-256: 144eccaa0176d969e256037e96daa23a462217cf46915515095e1f9943e41fe7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/123?utm_term=dsum+function+in+access+report PDF link annotation
    • https://cdn.sqhk.co/wosipuvetot/y8YzhdO/fezetigal.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzijaxab/ajjhgrO/q_r_ka_full_form.pdfIn PDF document text
    • https://cdn.sqhk.co/xanikadir/iee5jgY/31797107235.pdfIn PDF document text
    • https://cdn.sqhk.co/defegitip/S5jjMjg/61206086276.pdfIn PDF document text
    • https://cdn.sqhk.co/duputokodoz/5ge9ib6/15363234246.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/hjTbjiQ/74237560628.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/ephhu0a/kerasadaworaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/iXNqQwK/western_music_hd_wallpapers_1080p_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pavetikedur/jwgfkij/13058646239.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/jaNngcM/wejokizogavizuxujewurok.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
    • https://s3.amazonaws.com/jufowokedunod/21398462614.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/film_bukan_cinta_biasa_2009.pdfIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_5346d63b60984efa9c31e68edfa64014.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/59821136090.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/ionic_reaction_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/boniato_asado_informacion_nutricional.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/wupugukefibovupamumuvixag.pdfIn PDF document text
    • http://temidegizesoweg.rf.gd/bathroom_design_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/ofsted_report_baden_powell_primary_school.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/ffxiv_leveling_guide_30-_40.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/what_is_positive_psychology_and_why_is_it_important.pdfIn PDF document text
    • http://zijupowisupol.rf.gd/android_studio_anonymous_class_derived_from_onclicklistener.pdfIn PDF document text
    • http://xefowuvujikit.epizy.com/civic_education_zambia.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_16da237d676b46668f221b0b402698dd.pdf?index=trueIn PDF document text
    • http://jugikan.epizy.com/77764196050.pdfIn PDF document text
    • http://pevoxino.epizy.com/sierra_60_gr_tmk_223_load_data.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 5012 bytes
SHA-256: b030f0f0853d0d9778e9fc427f026e30337eed26789385c8f81b423cff2a8553
font_01_sfnt_off00010c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 11328 bytes
SHA-256: 3ef61b26aaeabd0c3fab326c4eb0f00e6b20169f25fd038ee5004793c80b752a
font_02_sfnt_off00013311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13311 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e