Malicious PDF — malware analysis report

Static analysis result for SHA-256 577804a458948315…

MALICIOUS

PDF

82.6 KB Created: 2021-05-11 15:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c10315d2ce0cf1ec2f5b58e130d9bee9 SHA-1: 7d20200f0f6880c27cadca54a6f70cbf10f24392 SHA-256: 577804a458948315b893befea95832d35632c5c0fde25c5d93a6cde5d8e456b7
186 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or leading users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://seumenha.ru/wb?keyword=lenguaje%20translation%20in%20english
    • https://kanazotevixif.weebly.com/uploads/1/3/2/7/132740718/42a174c.pdf
    • http://soxezujep.iblogger.org/union_budget_2019-_20_summary.pdf
    • https://tudogevu.weebly.com/uploads/1/3/2/7/132741144/4944492.pdf
    • https://kowumawadixowiv.weebly.com/uploads/1/3/4/8/134888970/motivoxofa.pdf
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/sebij.pdf
    • https://lumejukotexute.weebly.com/uploads/1/3/1/1/131163930/7f0d8e49ebe8d4a.pdf
    • https://risonozolediwar.weebly.com/uploads/1/3/1/3/131398017/kodufe.pdf
    • http://delinapod.mypressonline.com/valoracion_del_test_de_apgar.pdf
    • https://volamajujidek.weebly.com/uploads/1/3/4/6/134667755/kikepafesagi-wenisoguwekavud.pdf
    • https://zazobowelukoki.weebly.com/uploads/1/3/0/9/130969428/5e3ceb25.pdf
    • http://manamuposa.getenjoyment.net/samsung_business_strategy_analysis.pdf
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/7179226.pdf
    • https://balogidito.weebly.com/uploads/1/3/4/7/134726556/3674356.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/42741897-7d4a-4b65-9cb9-96fc9553b7f6/61163179279.pdf
    • https://s3.amazonaws.com/kisimujuk/sad_indian_background_music_free.pdf
    • https://s3.amazonaws.com/wemazun/bifumofu.pdf
    • https://uploads.strikinglycdn.com/files/0fce8e09-3303-4bb1-8978-22b3d00c6825/how_to_prepare_a_hot_dog_bun.pdf
    • https://uploads.strikinglycdn.com/files/641c76a0-b3cc-44cc-8e49-c33406d7cf4e/44679872696.pdf
    • http://xatulebebulife.rf.gd/27279803090.pdf
    • https://uploads.strikinglycdn.com/files/4f31b900-4941-4eb4-a785-1e87c4ded207/wilekosasafozopax.pdf
    • http://bivezekamolekaz.rf.gd/91474996301.pdf
    • https://s3.amazonaws.com/julaxel/ufg_o_diagrama_de_fases_da_gua__representado_a_seguir.pdf
    • https://s3.amazonaws.com/jezaxojipevu/newspaper_headline_template_ppt.pdf
    • https://uploads.strikinglycdn.com/files/eb31139b-a9d9-4b5f-8d5f-2403cd37c039/dijiwamedogak.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f80b.bin
0d6d3beeadf4e21ad81d0cebf5208dbf7aa67e58196d08e8209fa6d16d98badf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 4848 bytes
font_01_sfnt_off0001087e.bin
ed9159c97d1e0246dc61cd78fb0fbb65df572db6ed3e79f13de5eec83025a5b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 11644 bytes
font_02_sfnt_off00012eaa.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAA 4324 bytes