Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d74d97fe570a37a…

MALICIOUS

PDF

79.8 KB Created: 2021-03-05 03:09:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 65b14d1f8dbe7e7c84ecfde6726b96b6 SHA-1: 673294481a518c87c9546510a9894898a5297bcd SHA-256: 4d74d97fe570a37a5f0c5d290f7b8d9c9adf0e59f096a99eede8303b834c3891
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 SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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://fokemale.ru/wix?keyword=chemistry+13th+edition+answers PDF link annotation
    • https://niwurepezexeted.weebly.com/uploads/1/3/5/3/135312419/4011775.pdfIn PDF document text
    • https://ranetaxute.weebly.com/uploads/1/3/4/8/134886021/wefovaver-bilajab.pdfIn PDF document text
    • https://likifovufuli.weebly.com/uploads/1/3/4/5/134588617/19e1b8814c.pdfIn PDF document text
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/bibarasulidiwizates.pdfIn PDF document text
    • http://witaseru.iblogger.org/jaxenawigagifimodetagema.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/nimiriwaw.pdfIn PDF document text
    • https://fogevama.weebly.com/uploads/1/3/1/1/131164507/62218d.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
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_df8814be923a49079173fe0038ff77d7.pdf?index=trueIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_47e8c2d640604192a61f3df6d443fa08.pdf?index=trueIn PDF document text
    • http://wobuwikag.epizy.com/adnan_sami_album_tera_chehra.pdfIn PDF document text
    • https://8607b5f8-c2b2-49b7-a314-b17bd4efff40.filesusr.com/ugd/d99252_ab3c7ee57aa241208febb5186f17684b.pdf?index=trueIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_0fe1578f1e60467f8e0d135eb86c4d57.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_b47962fde7ba44958bde70b21744d553.pdf?index=trueIn PDF document text
    • http://gadusevi.rf.gd/bioscience_reports_impact_factor_2017.pdfIn PDF document text
    • http://vovivufevalo.rf.gd/ell_word_family_worksheets_for_kindergarten.pdfIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_b02e91794c064bf6b579e5395463e574.pdf?index=trueIn PDF document text
    • http://jomupaz.myartsonline.com/dosipufatobof.pdfIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_9b7a584fad8049dda622e1edb85a5a7a.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_c9402a67724747ae936cc0928fddd91e.pdf?index=trueIn PDF document text
    • http://voxunerejowiz.epizy.com/ritedudira.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_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 5256 bytes
SHA-256: 3bd33e7e229889ce0a8fe4646581303c8c080ab8718d928822b938757ac53cb6
font_01_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 15084 bytes
SHA-256: 04dd1ded5bfe5b70689900eaab1290d0085b75b11da138b7f92f4193e984428a
font_02_sfnt_off000123e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f