Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b663f8abf09c321…

MALICIOUS

PDF

77.7 KB Created: 2021-02-07 10:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4b3a47e996ac6120c7e63c0b73f8759b SHA-1: 0841aea3bdfe5768623fff1cdb147400619fbfa5 SHA-256: 4b663f8abf09c321511f23f7a93597bcede28e19c24f8d3638d96613aa4f7bbd
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and disposable hosting. This suggests a link farm or SEO manipulation tactic, likely intended to drive traffic to malicious sites or for phishing purposes. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wb?keyword=manual%20plastic%20bottle%20capping%20machine In PDF document text
    • https://banatili.weebly.com/uploads/1/3/5/3/135314160/738d27ea766f6a0.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/a0ed0.pdfIn PDF document text
    • https://kupalupatumer.weebly.com/uploads/1/3/1/8/131857031/b9182e6775.pdfIn PDF document text
    • https://cdn.sqhk.co/lenawemijixe/iyigHjf/new_gangster_crime_mod_menu_apk.pdfIn PDF document text
    • https://merogowaxoku.weebly.com/uploads/1/3/1/0/131069891/4933675.pdfIn PDF document text
    • https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/2516102.pdfIn PDF document text
    • http://pomuropujuj.22web.org/43317251926.pdfIn PDF document text
    • https://cdn.sqhk.co/nadudegimew/hcWbAic/kunap.pdfIn PDF document text
    • http://migriruy.ru/united_airlines_flight_information_telephone_numberc19b7.pdfIn PDF document text
    • http://seplafond.xyz/rinivikajivk1cx.pdfIn PDF document text
    • http://sofebitaxed.iblogger.org/forokumaduru.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/fdhdjfp/warby_parker_sunglasses_mens.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bajivuselome.epizy.com/94386292411.pdfIn PDF document text
    • http://setopuvoxuz.epizy.com/34505026330.pdfIn PDF document text
    • http://bobupugarini.epizy.com/ping_anser_putter_value_guide.pdfIn PDF document text
    • http://lunowakaneruf.rf.gd/tojavobulixijinisoja.pdfIn PDF document text
    • http://zofutigo.epizy.com/booklet_style_format.pdfIn PDF document text
    • http://roroturazukixij.epizy.com/32945538208.pdfIn PDF document text
    • http://bumufemukelogik.epizy.com/suzaririrulejuba.pdfIn PDF document text
    • http://selaxarizipa.rf.gd/63094205479.pdfIn PDF document text
    • http://lulojoduvos.epizy.com/acute_angle_triangle_information.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_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 4172 bytes
SHA-256: ca5da2f22f08239a59ed1bedcf654f7057d992a26a9a141cc004efd18fb7b463
font_01_sfnt_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 5396 bytes
SHA-256: c62280502d40916a7e3afe38099e6bdf085868f03c073a52985bf314525cf764
font_02_sfnt_off0001051c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 10540 bytes
SHA-256: 9d7e0480731d8b23dc89037f88e7c1e0ed7aa4eafda30df473a6854f4116ebd0