Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5192029e56ce3c2…

MALICIOUS

PDF

68.7 KB Created: 2021-03-07 20:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e87af6f2b5ee5754ce4f27dc643b6374 SHA-1: 3d77df31b96f785eba230dd5c424a89a99e67eac SHA-256: f5192029e56ce3c2a514fcad3c73fa23b72ac009b7d8112acc2a018b0c2ca232
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, masquerading as a crossword puzzle answer key, to a variety of domains. The primary malicious URL identified is 'https://xezojetit.ru/wix?keyword=photosynthesis+and+cellular+respiration+crossword+puzzle+answer+key'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection to external sites.

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
  • 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://xezojetit.ru/wix?keyword=photosynthesis+and+cellular+respiration+crossword+puzzle+answer+key PDF link annotation
    • https://mimuromujalu.weebly.com/uploads/1/3/0/7/130739347/ganezaw_telosasoxu_xipepete_dowifib.pdfIn PDF document text
    • http://bizuzagewad.iblogger.org/39408075886.pdfIn PDF document text
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/gimurul.pdfIn PDF document text
    • https://lejawoxaniw.weebly.com/uploads/1/3/0/7/130738778/2533788.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/divuxali.pdfIn PDF document text
    • https://migijulomav.weebly.com/uploads/1/3/5/3/135394851/mazipexejed_koxoriwuti_bonosawoz.pdfIn PDF document text
    • http://parubexe.iblogger.org/devil_may_cry_5_imdb_parents_guide.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/12f975b7-033d-4ebe-940d-96615e3cd208/57641831546.pdfIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_4e651e693dc04ad1873bd8999d187561.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokit/xazuluxo.pdfIn PDF document text
    • http://betemuzisifigej.epizy.com/zotaloxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/273ce506-6b4e-44a0-86ce-26d85d840a2e/wediraxonidurubekir.pdfIn PDF document text
    • http://lusalelafujijo.epizy.com/homophones_worksheets_5th_grade.pdfIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_8d53bd6fec114d7d83e83cab663f3ce8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dobesogum/note_speller_book_2.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/meruvevelofamirujuwo.pdfIn PDF document text
    • http://fojeropiralamab.rf.gd/what_is_a_global_marketing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af73d22f-f00a-4a09-9ea7-544dc1c6f5d8/nazm_hikmet_sen_iiri_ingilizce.pdfIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_dc01a8d36cc1485bac70b38d237a47f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ximupuv/integrated_circuit_powerpoint_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5273e018-cb41-4aa8-b7ce-08c8586a0481/lenuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b3eecf5-0983-4ede-b15f-6a19fc7c0e11/gitopuvokujejoreru.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_off0000ceb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB8 5472 bytes
SHA-256: a02504e991e0f4928893a4e9f91845faea62f48c1222c24c2ef1f13b578f7020
font_01_sfnt_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 10528 bytes
SHA-256: b6a3801e594bb9f6fc89566a14677ab9c2946c691e98141cdabdb31cc205db88