Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacc5d86c5be39e3…

MALICIOUS

PDF

80.2 KB Created: 2021-05-12 00:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 997d8914336c80e3d1d22f8378591cd8 SHA-1: 0e3395e71a608f5b1e7e0f7e1c54b3976c74aea0 SHA-256: aacc5d86c5be39e3c72e57a2ac0154fdad8b8154a99df6d4b3363128b36630b0
166 Risk Score

Malware Insights

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

The PDF contains multiple suspicious links, including an invisible link to 'lnstagram-support.live', indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to setting up a water softener, masking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://midufefew.ru/strik?utm_term=how+to+set+up+a+waterboss+water+softener PDF link annotation
    • http://dimax.website/jinexuz9d8z.pdfIn PDF document text
    • http://logoped-samara.ru/29478592690ywq7x.pdfIn PDF document text
    • http://mon-compte-cmb.best/43221390061ks53s.pdfIn PDF document text
    • http://busevabafumoje.iblogger.org/everyday_use_selection_quiz_answers.pdfIn PDF document text
    • http://pusolaxunu.66ghz.com/aprender_italiano.pdfIn PDF document text
    • http://m-laskin.ru/what_is_the_meaning_of_complete_metamorphosis8nxjc.pdfIn PDF document text
    • http://dkblogin-de.best/ny_drivers_manual_spanish95b77.pdfIn PDF document text
    • http://kir.center/amp_capacity_of_wire_sizesjp7tf.pdfIn PDF document text
    • http://agent-ritual495.online/amoeba_sisters_video_recap_answers_mitosis_vs_meiosis18yiu.pdfIn PDF document text
    • http://gisisavodure.22web.org/kilikogefetusubewejabuw.pdfIn PDF document text
    • http://lnstagram-support.live/proving_lines_parallel_practice_worksheet_answersvir04.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/sesijesule/zapelo.pdfIn PDF document text
    • http://kifasonow.rf.gd/hypoallergenic_foods.pdfIn PDF document text
    • http://gonedufugeferat.rf.gd/empty_set_solution_example.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/excel_vba_training_free.pdfIn PDF document text
    • http://zutotakome.epizy.com/aalwar_songs_free_starmusiq.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/85756982737.pdfIn PDF document text
    • http://tidefos.epizy.com/20119835793.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/formica_sheets_for_walls.pdfIn PDF document text
    • http://mofomunor.rf.gd/79880617762.pdfIn PDF document text
    • http://wogomud.epizy.com/baraxatowa.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_off0000ef4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 4888 bytes
SHA-256: 54fdea81abcef13b426b2a86e74bc70352f2c34f26306bcfdc3fe21ffd91f0b3
font_01_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 10864 bytes
SHA-256: 6b9230b221d2782d0496259b2d29d56389fdf3288b6e06744825c4e099011697
font_02_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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