Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b43f9730920f63a…

MALICIOUS

PDF

73.7 KB Created: 2021-05-06 20:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bc9887a3c124f8ab4c9c89903f829180 SHA-1: 04dcf3c0a29d6f0622e6a90fa911ce1d0d6ecc89 SHA-256: 5b43f9730920f63a665367e9eaf18c5d18f55820367e39415002df02dcf5a00b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of numerous external links, including one pointing to 'bologen.ru/strik', suggests an attempt to lure users to potentially malicious sites or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=what+is+an+lsc PDF link annotation
    • https://xagomutub.weebly.com/uploads/1/3/4/3/134321984/notavema_vavuwerik.pdfIn PDF document text
    • http://zikuwojanubeg.iblogger.org/nisavama.pdfIn PDF document text
    • https://lomivurusizova.weebly.com/uploads/1/3/4/8/134868764/4743340.pdfIn PDF document text
    • http://tadidavazutopa.sportsontheweb.net/animals_worksheet_esl.pdfIn PDF document text
    • http://dadumuxuwu.iblogger.org/60518987688.pdfIn PDF document text
    • https://pajuxosam.weebly.com/uploads/1/3/0/9/130968950/327ae511bd7d.pdfIn PDF document text
    • https://fumeseteno.weebly.com/uploads/1/3/1/4/131483149/valagefurapepijod.pdfIn PDF document text
    • https://verulezame.weebly.com/uploads/1/3/0/8/130814285/4767162.pdfIn PDF document text
    • https://wawenefawopi.weebly.com/uploads/1/3/4/4/134494228/393b0de6db9ea.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/facts_about_earth.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/1960303.pdfIn PDF document text
    • https://tarutugiwom.weebly.com/uploads/1/3/5/3/135326066/winogijow.pdfIn PDF document text
    • https://tupefumezamubew.weebly.com/uploads/1/3/0/8/130874634/tedunazajiju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fotubolore.epizy.com/af_90t_capsule_filling_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d955aa71-dabf-4836-8a5d-d388cb3c69fa/coleman_powermate_5000_watt_generator_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/gary_chapman_5_love_languages_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4bb9b20-e5fb-460f-b1a1-bdb60cdf5cd6/giwuvugolafukuvuduzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7058bcea-79c9-434f-a531-9481c8235a27/bigibalawonajulifo.pdfIn PDF document text
    • http://fuwutowamig.myartsonline.com/busile.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/26917899378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc96336-313e-44bc-9b4c-c39a53312d5b/the_little_prince_mp3_free_download.pdfIn PDF document text
    • http://xasagamuforokek.rf.gd/how_did_the_wall_street_crash_affect_the_great_depression.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_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 4804 bytes
SHA-256: cadc40d99939bb1dafe80fb201571f777a607187b1773ac0c786779d3018f676
font_01_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 11460 bytes
SHA-256: e3935ee0093d68fcad42214d4e3afd28960a64674e5386c23e839caca2d11219