Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb21a890f6ee3056…

MALICIOUS

PDF

72.5 KB Created: 2021-04-27 18:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: de835ce3bd07f5b1034be1403dfa64df SHA-1: 48617c3cec99d4f97f372108f530ad1505c9d282 SHA-256: eb21a890f6ee3056570681dc7b89e555abf98838b956209d7f874c15ab41fb6f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URLs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The document body, though heavily corrupted, contains text related to a Casio watch, likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=casio+men%2527s+g-shock+tough+solar+digital+atomic+watch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480895/normal_606266503a19b.pdfIn PDF document text
    • http://gratoramaa.website/rapupijeganugisatebusibga4qz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_60347c9fbe6df.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/iihagfY/funny_pics_of_dogs_and_cats.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/c7lLjjg/74743008602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369907/normal_600730957bd53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445871/normal_6048da74a099a.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/kertas_kerja_sarang_burung_walet.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/carbs_in_dunkin_donuts_small_hot_chocolateyqztu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393180/normal_5fec49a580687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490929/normal_5fe9d67dd75e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447096/normal_6046976a78479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425487/normal_6049f620dcc47.pdfIn PDF document text
    • http://flowerport.market/wetebixanulotorogilomejel7r3mr.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/how_to_recharge_a_portable_water_softener.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474979/normal_60371abfbbffc.pdfIn PDF document text
    • https://g-shock.co.uk/tough-solar-watchesIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/32299541063.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/two_way_radio_shoulder_holster.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/mikofuvowo.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_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 5480 bytes
SHA-256: aa992f69ead818cff6085ede6a4f846242c1872b226c5754079974cdb488c81a
font_01_sfnt_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 10268 bytes
SHA-256: cca15f16e707c28a91f7ddf2766541570ef7593f99aa2c20e28476977d787b1c

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