Malicious PDF — malware analysis report

Static analysis result for SHA-256 e995881fb5d67b61…

MALICIOUS

PDF

79.0 KB Created: 2021-04-04 00:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3ec4f0578a8945fa57297ba2275aff01 SHA-1: dd1fced82072d92dcde21e8a365460334e8c46e1 SHA-256: e995881fb5d67b614f155d92c7d74d0a63736ea79c6f6906ac74905ea1c3618f
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 0.9997

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://jumiwimov.ru/strik?utm_term=the+night+manager+season+1+episode+5+recap PDF link annotation
    • http://buvalopexur.mygamesonline.org/31941563753.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/f5yibjd/sofijobezatamodunugu.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/jjxtidK/train_times_newcastle_to_sydney_saturday.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/eHjhfnr/43710580880.pdfIn PDF document text
    • https://zedetebi.weebly.com/uploads/1/3/1/0/131070456/9140700.pdfIn PDF document text
    • http://niwopofe.scienceontheweb.net/the_raven_edgar_allan_poe_book.pdfIn PDF document text
    • https://xukoperupe.weebly.com/uploads/1/3/4/7/134743664/ranusamar-naguduro.pdfIn PDF document text
    • https://jukatuve.weebly.com/uploads/1/3/2/7/132741058/leruz-geverero-mekademomituzom.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/sghiOjg/potion_recipes_skyrim_healing.pdfIn PDF document text
    • https://jarurozo.weebly.com/uploads/1/3/5/3/135320013/9943f66aa584c83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pujirageg/motu_patlu_cartoon_episode_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/vujeboga.pdfIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_e6cee486834647bc8e8b4d3fa9d4986c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/whatsapp_status_video_hdvidzpro.pdfIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_c397bf98017b463caf71b0c7f19eb65b.pdf?index=trueIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_4bdef02c2b6f4c5684ee61ce882ef2f8.pdf?index=trueIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_c8bb0a45078e4c9d8de402de9c051114.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d054bd-d258-46be-b62d-7cb21cbed502/how_to_calculate_the_average_density_of_earth.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_330127ef68fd4b1cbc3688bbdb6727aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1197e39-d79b-4e7c-b4ba-f987586ece71/wojaxuripixubaletimuto.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/subogomi.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_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 5580 bytes
SHA-256: a55fe88e42fa7505764f267b289bf1bb3233d2d37d79349727ed2a2906fa6c18
font_01_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 11016 bytes
SHA-256: 3e5d9d7f44f8ea245b1dd33fcfd1a8ef171cfe626a1d15820ade1cc05f0e76fd