Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b3bdeb53991ed8…

MALICIOUS

PDF

75.3 KB Created: 2021-05-01 15:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8e06f6a8dd1fa1dfedb2fad1d8f9e8c1 SHA-1: 22c2ddf1b0d4057e69cbcf300f7e1bd3bd1a62b1 SHA-256: 23b3bdeb53991ed834084e65d3b99c8577d87ad4a0f1b2a336e6bb58f000d67c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains or link farms, suggesting a phishing or credential harvesting operation. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this. No scripts were extracted, but the overall structure and URL distribution are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=honeywell+hcm-350+germ-free+cool+mist+humidifier+uk PDF link annotation
    • https://cdn.sqhk.co/wimiwupo/jfeOgdg/tufovuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_603142d0297cf.pdfIn PDF document text
    • http://wilitubejibo.iblogger.org/60815545605.pdfIn PDF document text
    • http://varuzajuv.22web.org/anorexia_y_bulimia_nerviosa_en_adolescentes.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/3OjhtKE/56753090283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413976/normal_603c4aeb54df8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_605a4ba57d984.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/giCwig0/word_cookies_halloween_event.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_600f01522c09b.pdfIn PDF document text
    • https://cdn.sqhk.co/mapexovebo/gNYi9ic/real_racing_3_apkpure.pdfIn PDF document text
    • http://dalidokumum.22web.org/garmin_forerunner_410_manuale_italiano.pdfIn PDF document text
    • https://cdn.sqhk.co/menodotitit/XgghenL/ripowepavorolugekise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_60261928af074.pdfIn PDF document text
    • http://gofofikazujepav.22web.org/advanced_vocabulary_words.pdfIn PDF document text
    • http://nawididu.iblogger.org/lagu_hallelujah_the_voice_kid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493589/normal_5fcc777765f1f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0e7aa9a-e69f-436a-b2a3-ed25d3296cb7/how_much_does_chick_fil_a_pay_an_hour.pdfIn PDF document text
    • http://vufepaketotaxo.epizy.com/zisikumujinawemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a874d8aa-15e1-420d-bbdd-9d27031ab426/88845393116.pdfIn PDF document text
    • http://gesonumakokobal.rf.gd/android_studio_cannot_resolve_symbol_button.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_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 5908 bytes
SHA-256: 085d29137e1969d336537719189b3ffb01b7cf6bf79bb6ff15bb51dd2c95c13d
font_01_sfnt_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 10504 bytes
SHA-256: 66d33998bf1342a15f75a7a81d2b3728f5e80404a27d6cc9d2dc830662276aa2

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