Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ffb28cb112bd49…

MALICIOUS

PDF

76.3 KB Created: 2021-02-03 02:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 00d4589a10f07c4250815b5ab4aa16b5 SHA-1: 234abfef6a88980202831526cd8288f761dac1c4 SHA-256: e6ffb28cb112bd49dd19a0f589ce18900952413a2ee7710b0648f8364c702c35
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary external URIs points to 'https://crophysi.ru/aws?utm_term=math+worksheets+grade+1+regrouping', which is likely a lure. The document body is heavily obfuscated and appears to be generated content, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/aws?utm_term=math+worksheets+grade+1+regrouping PDF link annotation
    • https://xazepobuzu.weebly.com/uploads/1/3/4/5/134582826/masip.pdfIn PDF document text
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/753164.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/2oGTuez/free_rock_music_apps.pdfIn PDF document text
    • https://seboneluwisog.weebly.com/uploads/1/3/4/3/134368334/9341279.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/tojukizubugeb-zubuse-xamobuwibomumi.pdfIn PDF document text
    • https://tenosufude.weebly.com/uploads/1/3/1/4/131455069/3364504.pdfIn PDF document text
    • https://gamabisage.weebly.com/uploads/1/3/2/6/132681080/kupaloxumaraf_besexuxufini.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/ibTyjcA/cinema_light_box_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/ZvrsXid/tinkerer_marvel_wiki.pdfIn PDF document text
    • https://sarejazaxixosib.weebly.com/uploads/1/3/4/6/134633098/4483602.pdfIn PDF document text
    • https://farazekij.weebly.com/uploads/1/3/4/3/134379469/lenikerurodabesi.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/mamukawaxatali/28117292018.pdfIn PDF document text
    • http://marivugedada.epizy.com/lefigedepubi.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/bls_reference_card.pdfIn PDF document text
    • http://nabunuwo.epizy.com/plastic_sheet_extrusion_line.pdfIn PDF document text
    • http://fogafixajusel.rf.gd/below_her_mouth.pdfIn PDF document text
    • http://dogabofeki.epizy.com/amilum_manihot.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/answer_the_questions_below_in_your_notebook.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_off0000eb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 5404 bytes
SHA-256: 5988cbece3bfbaf77f3ef55c2fb04e8676cbeb314bb4dba0180ffa4257ef28dd
font_01_sfnt_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 10768 bytes
SHA-256: ce3083fa0ef5a3caddedff1d5712419286531a8eba1aa35e5aea36d64b5a72e7

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