Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5314c4b9bba816…

MALICIOUS

PDF

78.1 KB Created: 2021-03-19 12:10:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0e90057c4bd2dd92959be4959cce40f1 SHA-1: 5d864255848f7831bd30be0c0db0d16c228d3b11 SHA-256: 1c5314c4b9bba81684409c32ba814986c8e545c79d44599edc7ca8064b75580b
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 0.9993

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://mezovuduw.ru/strik?utm_term=why+won%2527t+my+fiskars+staple+gun+work PDF link annotation
    • https://nazutusimeraj.weebly.com/uploads/1/3/4/8/134883567/gejiwoxunilida.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/3idggij/23006117611.pdfIn PDF document text
    • http://nemurirewokow.iblogger.org/misty_jazz_piano_solo_sheet_music.pdfIn PDF document text
    • https://nudabubi.weebly.com/uploads/1/3/4/3/134323665/megunixoxixud_folugidomelavon_zubofesepaxe_tutawugerapibub.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/hiohgN2/athletic_apparel_wholesale_suppliers.pdfIn PDF document text
    • https://komamopiragi.weebly.com/uploads/1/3/4/4/134444029/xirugeriromo-genibob-nadomotodexuv.pdfIn PDF document text
    • https://pokotozumunas.weebly.com/uploads/1/3/1/4/131453498/2f28c6f.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/eGuhgzr/zuxegafomajuxegamep.pdfIn PDF document text
    • https://xogofodaromaf.weebly.com/uploads/1/3/4/3/134387758/xekulopatijule.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/gk6ghja/regency_theater_in_perris_california.pdfIn PDF document text
    • https://jipunone.weebly.com/uploads/1/3/5/3/135349916/4049995.pdfIn PDF document text
    • https://pawusimogi.weebly.com/uploads/1/3/4/4/134444718/9236690.pdfIn PDF document text
    • https://tewabigonin.weebly.com/uploads/1/3/4/7/134760563/c73730e77d7.pdfIn PDF document text
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/9227733.pdfIn PDF document text
    • https://giridoxaxe.weebly.com/uploads/1/3/4/7/134703098/vodubelemo.pdfIn PDF document text
    • https://mowofagafuvu.weebly.com/uploads/1/3/4/5/134594922/11f57ccd18c.pdfIn PDF document text
    • https://cdn.sqhk.co/sogupavetut/nihjcji/ribibunepidifamaxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/96413911467.pdfIn PDF document text
    • http://bulalejovadidov.rf.gd/19301596242.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/the_office_script_season_1_episode_1.pdfIn PDF document text
    • http://puwawetodu.rf.gd/pidegapebetisizoselabutux.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/comparing_fractions_cross_multiply_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/what_does_helter_skelter_mean_in_the_beatles_song.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_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 5620 bytes
SHA-256: e94f6d9ea03bf70daf25b51c0fcabf13e4285e1685d62eafb82570d9d5feea29
font_01_sfnt_off000106a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 10652 bytes
SHA-256: a5bbc2b3152e9e97630e9afddc51a74cfa0e0a576ec13ab6bd8baec1bbba5ce8