Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f45b98f5da7921c…

MALICIOUS

PDF

94.1 KB Created: 2021-05-05 18:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a6f3434d892550e4cb705e17ce233622 SHA-1: 0f3d7b7177c87ad2786406c61160bc5d884453f3 SHA-256: 1f45b98f5da7921caaac7aed8f0c952570f72dc63de6a3f4595bd37e529a999f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, characteristic of a link farm designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the numerous external URLs suggest the primary function is to lead users to compromised or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=resumo+do+livro+de+daniel+goleman+inteligencia+emocional PDF link annotation
    • http://clientesdkb.com/flip_skater_mod_apkxq1qy.pdfIn PDF document text
    • http://hayatevesigar.online/joseph_campbell_hero_s_journeyq0xq3.pdfIn PDF document text
    • https://sokowerifali.weebly.com/uploads/1/3/6/0/136053586/javoxunij.pdfIn PDF document text
    • https://vobasonuniba.weebly.com/uploads/1/3/4/6/134668907/ce73cb80d1e6e.pdfIn PDF document text
    • https://saworajopasu.weebly.com/uploads/1/3/0/7/130775294/xavagibin.pdfIn PDF document text
    • https://sejirefado.weebly.com/uploads/1/3/4/6/134682993/5123a45.pdfIn PDF document text
    • https://xiliperudal.weebly.com/uploads/1/3/3/9/133999468/wisoj.pdfIn PDF document text
    • http://uabiomanix.xyz/macbeth_freekph9p.pdfIn PDF document text
    • https://juzuxadubibipa.weebly.com/uploads/1/3/4/6/134685448/18fe7.pdfIn PDF document text
    • https://bovuxugiz.weebly.com/uploads/1/3/4/9/134901291/gofixun.pdfIn PDF document text
    • https://fejoburu.weebly.com/uploads/1/3/0/8/130813906/6ec5212.pdfIn PDF document text
    • https://xisiwifuroki.weebly.com/uploads/1/3/5/3/135323104/sewovawonekana.pdfIn PDF document text
    • http://wuromigujab.iblogger.org/rabobujozuporavuw.pdfIn PDF document text
    • http://blancer.xyz/tigers_quest_read_onlinelf51d.pdfIn PDF document text
    • https://gizomedapirev.weebly.com/uploads/1/3/1/4/131454265/masisol.pdfIn PDF document text
    • http://topdiscount.pro/impossible_quiz_1_23_answerzb0uv.pdfIn PDF document text
    • http://latofolakop.22web.org/iskcon_bhagavad_gita_in_marathi.pdfIn PDF document text
    • http://zilixijabukepul.iblogger.org/64278606809.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://dowijasimenazo.epizy.com/casper_platform_bed_reviews.pdfIn PDF document text
    • http://kubobizezaf.epizy.com/85781467346.pdfIn PDF document text
    • http://lopumupukerodu.epizy.com/tonegiku.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED9 5208 bytes
SHA-256: 650feea038923f1fa05409821631be5a6f24e0ac62909d53f25b3f8d7aa56543
font_01_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 2116 bytes
SHA-256: 8db65adc699bed2ed4e99b174e414cace916d9ae25f4e5597e3d94de4d1667c8
font_02_sfnt_off00011a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A20 14092 bytes
SHA-256: 434676a4734e987add1bc483fad86aa412b96d50b15cbc861638052b141bd195
font_03_sfnt_off00014442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14442 16256 bytes
SHA-256: 434aae299edf0176e671ab3bc0d322c8073aab91b2f5b9b6b437fcae9386e09a
font_04_sfnt_off0001599f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1599F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2