Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce96f8cb42a946ed…

MALICIOUS

PDF

81.5 KB Created: 2021-04-10 23:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 821fe7f0407513e15f194eaedb093ef4 SHA-1: d1275f5a143708b6c2a58ee785fbfbe6eb14c03b SHA-256: ce96f8cb42a946ed50ba1ef425aa6577c807d93fdbf35f15aaabc8c2834cc102
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://mezovuduw.ru/strik?utm_term=integration+of+1%252Bcos%255E2x%252Fsin%255E2x
    • https://cdn.sqhk.co/wagomito/hhjgfFF/bifetamebupawurobuzoju.pdf
    • https://vuvunovugigadi.weebly.com/uploads/1/3/0/8/130814714/6889206.pdf
    • http://wobijovo.22web.org/ncert_maths_class_11_solutions_download.pdf
    • http://nasty666.space/drawing_and_painting_classes_for_adults_in_chennaiindyo.pdf
    • http://yourbigdick.space/57722161090bsr18.pdf
    • http://plafond.xyz/rapoxudibifogifimesefixf3nd8.pdf
    • http://bofesota.66ghz.com/62743732613.pdf
    • http://kuxogajow.iblogger.org/20978696374.pdf
    • http://smcjd.com/analogy_worksheets_with_answers_for_grade_30ugsn.pdf
    • http://carishr.com/python_pandas_tutorial_free_download3bjuc.pdf
    • https://cdn.sqhk.co/difanemifal/ieSpjb0/56523317309.pdf
    • http://cartest.pro/401832306571m8bw.pdf
    • http://natnat.fun/92387409972mc762.pdf
    • https://rilopogikumifo.weebly.com/uploads/1/3/4/3/134320310/lezigebekobi.pdf
    • https://cdn.sqhk.co/gisatajofo/jiZicDt/41236812936.pdf
    • http://handler-autoscout24.com/pentatonic_scale_saxophone_beginnersysd68.pdf
    • http://circus.market/2031540095915y1.pdf
    • https://vixadabunukup.weebly.com/uploads/1/3/4/9/134902839/nolugetuwo_xudefexasare_rurikafow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feruvemijajo.epizy.com/oecd_guidelines_transfer_pricing_2010.pdf
    • http://busapow.rf.gd/amnesty_international_death_penalty_2020.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e630.bin
6ab242d2440a583a51dce249d97b4f11a208e421b3c14cb517a9d15ae97e3707		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 5292 bytes
font_01_sfnt_off0000f868.bin
559d473328d9226ee5ec9d52b1973b1bd5c1c17fd72e02f24e0b6f5b5ede3700		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 12916 bytes
font_02_sfnt_off0001230b.bin
2f3be8bea97e45cda65c67867e90aca9551e97f49a2978742e73016bce63220d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 16172 bytes

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