Malicious PDF — malware analysis report

Static analysis result for SHA-256 9839da572f83e801…

MALICIOUS

PDF

86.5 KB Created: 2021-03-22 00:59:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 744f6dd0522c8d5e42333e901a968f2d SHA-1: 9ac2d35d765deb058e3e727e1e0a25bede48aa62 SHA-256: 9839da572f83e8019450e2cca4676bfedec3ea00898f4c3abc9826dfb3c79d0a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. The embedded URLs and the structure of the document point towards an attempt to lure users to external sites, potentially for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://resalured.ru/123?utm_term=answer+love+myself+lyrics+meaning PDF link annotation
    • https://winudepawo.weebly.com/uploads/1/3/4/1/134132470/8545492.pdfIn PDF document text
    • http://muzesumulel.getenjoyment.net/reconstructing_native_american_population_history.pdfIn PDF document text
    • https://pupifino.weebly.com/uploads/1/3/0/7/130776741/10000253.pdfIn PDF document text
    • http://timinome.getenjoyment.net/wheres_waldo_womens_halloween_costume.pdfIn PDF document text
    • https://warajepujevofi.weebly.com/uploads/1/3/1/8/131857140/436296.pdfIn PDF document text
    • https://tawojupaker.weebly.com/uploads/1/3/4/8/134885799/kevikul.pdfIn PDF document text
    • http://nobukuxokosiga.mypressonline.com/mexoduwiribosetezal.pdfIn PDF document text
    • https://bununijadepijag.weebly.com/uploads/1/3/5/2/135298825/0389586.pdfIn PDF document text
    • https://vinosubolab.weebly.com/uploads/1/3/5/3/135316207/1606722.pdfIn PDF document text
    • https://bazifimu.weebly.com/uploads/1/3/4/6/134661545/11d0a00ac.pdfIn PDF document text
    • http://vnds-super.space/32885515991ww2r4.pdfIn PDF document text
    • https://vomimefime.weebly.com/uploads/1/3/5/3/135316042/88b0d9e755.pdfIn PDF document text
    • https://kezivujiwot.weebly.com/uploads/1/3/4/3/134329954/27937.pdfIn PDF document text
    • http://peludofnor.fun/lufuwure726lw.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/worship_songs_lyrics_chords.pdfIn PDF document text
    • http://koprovk.xyz/what_is_the_importance_of_sound_in_our_daily_life94rij.pdfIn PDF document text
    • https://sujugixuguxidi.weebly.com/uploads/1/3/4/6/134615921/marokovurejorurogole.pdfIn PDF document text
    • http://edapog.online/menilefavubegitawetnpj9d.pdfIn PDF document text
    • https://rimofemosi.weebly.com/uploads/1/3/4/3/134351632/482ccf.pdfIn PDF document text
    • https://tukobigerokigab.weebly.com/uploads/1/3/4/6/134653943/vinilaxoj_zitod_zilunimawevotek.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/rudelazifizuvo/zidagi.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/pusagajukagorujav.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/mikimovuded.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 3516 bytes
SHA-256: 198caa07014e4db04ee93852610f83ce7d50861fa39b6d372677e3b12cdb6431
font_01_sfnt_off000105f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 5152 bytes
SHA-256: 264fcaf5b97b07af463cbe6d3170f70ddfb73a3bb0bfaa8806619ec167d013ab
font_02_sfnt_off00011773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11773 10844 bytes
SHA-256: 06e29daffed9c91e170b2a605bec79e819d1a31dc8368df8ef9b58e04994077b
font_03_sfnt_off00013c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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