Malicious PDF — malware analysis report

Static analysis result for SHA-256 5623b99a2b1c4331…

MALICIOUS

PDF

71.5 KB Created: 2021-01-29 11:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c43c8bffd5f2ce3d6a395fc4f710b0d7 SHA-1: 239fb3ceb990c1505965f745b94d9c36a1345ddf SHA-256: 5623b99a2b1c43316cf08fec55f697dd4bca2a08cdb407d36b6ea541e7fa0036
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=nutrition+guide+for+clinicians+second+edition PDF link annotation
    • http://iwhite.space/categorias_del_materialismo_dialectico_rosentalfy7uf.pdfIn PDF document text
    • http://autokenn.com/sisters_oregon_15_day_weather_forecastotqjq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456687/normal_6007aae34dbcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372982/normal_5fd1a1a3efb30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420240/normal_5fcdb72d797e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366357/normal_5fdcaf04049ac.pdfIn PDF document text
    • https://volejodanuba.weebly.com/uploads/1/3/4/5/134593723/cd68a943a8b95.pdfIn PDF document text
    • https://refedekejevejat.weebly.com/uploads/1/3/4/3/134312363/suxedejupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_60137fcd82dd3.pdfIn PDF document text
    • http://tevopose.66ghz.com/answers_for_math.pdfIn PDF document text
    • https://gijesilikisuzid.weebly.com/uploads/1/3/2/6/132683000/numigejafugawi_lenopogowuti.pdfIn PDF document text
    • https://doxefifuz.weebly.com/uploads/1/3/0/9/130969363/rozelemotiradiwiman.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
    • http://vikarexazoz.rf.gd/blonde_hair_blue_eyes_karin_slaughter.pdfIn PDF document text
    • http://sefatefa.epizy.com/levodopa_carbidopa_davis.pdfIn PDF document text
    • http://kipixuge.epizy.com/75158962673.pdfIn PDF document text
    • http://dupetomumipur.rf.gd/jimeral.pdfIn PDF document text
    • http://pakafadudu.epizy.com/whirlpool_oven_manual_timer.pdfIn PDF document text
    • http://fajiwuwigekelal.epizy.com/kujiwevaforugik.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_off0000ce50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE50 5040 bytes
SHA-256: 841c49de491d799ed059b57aa6f3022c90a7a27f4c5559d82be296ab29a5fca1
font_01_sfnt_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 10416 bytes
SHA-256: a4af322ab4ce755495effe2d7608deef9d6e54c37c435806ca6968499891cff5
font_02_sfnt_off000102bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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