Malicious PDF — malware analysis report

Static analysis result for SHA-256 114389f5a89d06cd…

MALICIOUS

PDF

82.5 KB Created: 2021-03-27 22:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3761da10801056cc340aeb3a8ed61dbe SHA-1: 17302dfc8f58f9154a305a36eb20c39f84d075c0 SHA-256: 114389f5a89d06cd2b81000ef09e2554ace65cc1b8c215344aeda79e36b52167
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://gimoguvi.ru/aws?utm_term=handy+stitch+handheld+sewing+machine+video PDF link annotation
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/guporuzib.pdfIn PDF document text
    • https://pukefigagarit.weebly.com/uploads/1/3/1/4/131406744/mujojerojiwumubek.pdfIn PDF document text
    • http://termometr-medikal.site/naruto_shippuden_games_psp_freehlbjw.pdfIn PDF document text
    • http://golomashvanna.xyz/visual_basic_tutorials80eg0.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/fGhhCgc/89789453789.pdfIn PDF document text
    • http://flash-sar.online/ejercicios_ecuaciones_primer_y_segundo_grado_2_esopmm5b.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/gfmjahb/97337599580.pdfIn PDF document text
    • https://tolibopajam.weebly.com/uploads/1/3/4/4/134487495/489599.pdfIn PDF document text
    • https://gegiwozik.weebly.com/uploads/1/3/4/7/134719936/23090fe3be7e1a2.pdfIn PDF document text
    • https://xizikako.weebly.com/uploads/1/3/0/9/130969027/nusigamuvib.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/8vxhdic/guide_to_agent_dashes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_a15ab5fd03b244a3a19018ec02275951.pdf?index=trueIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_30fa75d5a5c24f90acb5fcc54e6fb1c2.pdf?index=trueIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_108b99119d804f4ca409f4185493a8dd.pdf?index=trueIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_90b06ce1e95a450bbba84767eccb033a.pdf?index=trueIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_11bf7e7fac154aac985550fdec141003.pdf?index=trueIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_efa7e138c7334631978118cde34a4fae.pdf?index=trueIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_6a28e5f030be4366a7b5b5dfcf95aca8.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 5472 bytes
SHA-256: e07e20617f93ae77077662d00a3a2a8c5478e899160290da8ee803419826b2d4
font_01_sfnt_off00010331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 10656 bytes
SHA-256: 3b14089754559b43e5c45e1b03dd00fdad25d318d77a321c9adb94bc42842201
font_02_sfnt_off000127af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953