Malicious PDF — malware analysis report

Static analysis result for SHA-256 5caf639e06be4494…

MALICIOUS

PDF

73.2 KB Created: 2021-06-03 16:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d06ae3f430f639ec795bf63247243da8 SHA-1: 6754a2598eeaadd5d1a9b9ccbd50caef2745b2f6 SHA-256: 5caf639e06be4494526e9d6fb2d2ca73fdb1320e28431290405bda27d693466b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content, potentially for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://garglob.ru/pbw?utm_term=significant+figures+practice+with+answers PDF link annotation
    • https://zulazuxalumino.weebly.com/uploads/1/3/1/6/131606396/e74c4695.pdfIn PDF document text
    • https://manabaxijex.weebly.com/uploads/1/3/4/6/134626004/velegizupobubive.pdfIn PDF document text
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/d84a414c31a740.pdfIn PDF document text
    • https://wadabugijiri.weebly.com/uploads/1/3/0/8/130873870/5f24589a.pdfIn PDF document text
    • https://mefinijusigoti.weebly.com/uploads/1/3/4/4/134499215/wawegufori-vureginetag-juziva.pdfIn PDF document text
    • https://gefeteki.weebly.com/uploads/1/3/4/3/134310298/f4f6a2e4c.pdfIn PDF document text
    • https://nibafowezibinax.weebly.com/uploads/1/3/4/3/134319588/rilosazujazopevuzati.pdfIn PDF document text
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/pijaxafobavivo_reputolotisoj_jatenar_kekarim.pdfIn PDF document text
    • https://negedawitadunez.weebly.com/uploads/1/3/4/5/134587096/xupuxusa-kibubesugazimiz-sowurego.pdfIn PDF document text
    • https://vebaduxop.weebly.com/uploads/1/3/5/3/135327545/3162516f7d.pdfIn PDF document text
    • https://vatozuserivowi.weebly.com/uploads/1/3/4/3/134385792/gufutoxoxa-gomusujisusegaj-ramuvonamit.pdfIn PDF document text
    • https://katebobuwusa.weebly.com/uploads/1/3/1/3/131384636/36690dd1.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://vulazojab.pbworks.com/w/file/fetch/144547371/95841482902.pdfIn PDF document text
    • http://subazim.pbworks.com/w/file/fetch/144545775/super_smash_flash_2_cheats.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/naxurabofudizisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a78a48-793f-4007-ac34-950e4da0a02e/65101883477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19818a93-f95f-4d14-9745-54fe7d12d030/why_wont_my_furnace_heat_up.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/w/file/fetch/144463689/la_princesa_que_creia_en_cuentos_de_hadas_audiolibro.pdfIn PDF document text
    • http://fujiserefi.pbworks.com/w/file/fetch/144554868/gazegixalugitafuvajon.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/are_we_alone_in_the_universe_quotes.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/70945814974.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/street_dance_of_china_season_2_winner_mentor.pdfIn PDF document text
    • http://wixugigir.pbworks.com/f/board_kings_hack_without_human_verification.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_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 5212 bytes
SHA-256: f0d22d0fe2bf610bf49f093080b95c8c1eddd9af75463a5dc7a59fcc60fc1039
font_01_sfnt_off0000e59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59A 10380 bytes
SHA-256: 4d9350c02aec0e7994822de18492e75bbf2e9a0af314ac003f36c10524416c72
font_02_sfnt_off00010936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2