Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc436b409d7b6f7…

MALICIOUS

PDF

73.5 KB Created: 2021-02-24 14:34:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 73df7fd4987fc47c33a58618cb5657f0 SHA-1: 789fb26f4007886dc43dbbebb6fe24552a0e6c31 SHA-256: 5dc436b409d7b6f7c5d0a0d9d2265d4c7a697505e08a6df49ed7523b965c5937
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed for SEO manipulation or phishing. The primary URL, 'https://crophysi.ru/strik?utm_term=computer+network+technician+salary+in+california', suggests a lure related to job searching or salary information. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=computer+network+technician+salary+in+california In PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/dubun-voxul-koxuletawifila-vigunafuz.pdfIn PDF document text
    • https://nukimaxirob.weebly.com/uploads/1/3/0/7/130776041/vutejobisi_revazol_wuboninisajo_sazim.pdfIn PDF document text
    • https://keboxatoxumire.weebly.com/uploads/1/3/4/5/134591907/6323718.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/tugunelup.pdfIn PDF document text
    • https://nejajabowiwuxo.weebly.com/uploads/1/3/0/7/130775705/sazexud.pdfIn PDF document text
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/wotusilorifijo_tefuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447640/normal_5fe9714c75049.pdfIn PDF document text
    • https://voxomusixexuso.weebly.com/uploads/1/3/4/8/134851372/1068dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464874/normal_5fee48bd8b21e.pdfIn PDF document text
    • https://sotemupavunu.weebly.com/uploads/1/3/1/4/131413148/lazewinidotamu-vixipiribe-popapata-bodixebab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404739/normal_6013e94d3c7a8.pdfIn PDF document text
    • https://tozupetap.weebly.com/uploads/1/3/1/3/131383790/punogegajerule_mirilelax_ruzuwogixe_xinejexugizina.pdfIn PDF document text
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/jasilalako.pdfIn PDF document text
    • http://gabofovopajojo.iblogger.org/30654715955.pdfIn PDF document text
    • http://mainsale.pro/gekovixixek5wxku.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://jupanifoz.epizy.com/6818073386.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_off0000d2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C3 5416 bytes
SHA-256: bf866dff04c792ed10c4244da1c12d07624acfd3c633e3b1c25b93cd14208066
font_01_sfnt_off0000e51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51A 10788 bytes
SHA-256: 8552e793f953f11fa61adee3b1de5fba79c3887560b0974878d08ce5f42f23b1
font_02_sfnt_off00010a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34