Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb105e7ab3cdfd03…

MALICIOUS

PDF

76.2 KB Created: 2021-03-13 20:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: db83badf21c7401bf89d36f2cb88cf88 SHA-1: 55b7a9770df5f7f5215dac57764762883a18fff7 SHA-256: fb105e7ab3cdfd0386301c6b05ec1198114928c87a834c11ce2ec18596c8ae56
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9996

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lozipotod.ru/strik?utm_term=fedex+customer+service+email PDF link annotation
    • http://4gusevshop.website/jaxuxoxadajevogokes10e8s.pdfIn PDF document text
    • http://ig-about.net/is_the_revenant_based_on_a_real_story2yy5x.pdfIn PDF document text
    • http://shishkin-seed.xyz/fipujeratewoniuq361.pdfIn PDF document text
    • http://oneplusonemain.xyz/attack_on_titan_characters_names_animerje7x.pdfIn PDF document text
    • http://wigojomet.22web.org/cooking_academy_4_free_full_version.pdfIn PDF document text
    • http://subfamjtii.site/dujiwopoxonoke9x36f.pdfIn PDF document text
    • http://procripton.com/adobe_premiere_pro_tutorial_beginner2h5df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ee7e76c-d857-49c8-8ce2-2a098eadc2c9/garonofasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e91d409f-94b6-44cc-8806-022c9f04bb8c/69152579263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f525eefc-10a5-4328-865d-6076049cd017/pixole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/113fbdcb-6c5f-4854-bdc6-b54df5d53024/how_to_know_if_something_is_a_strong_or_weak_acid_base.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b7bec1-73ad-4f66-9a1b-066afdd8c63e/fujibulip.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_2fb744b1574e4b10b2bdbc3f0656ed5d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f686d7ff-f6c6-4ad3-a784-e68a27cdbceb/26071804478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a48c9bc-cace-4f4c-8819-9beca01ddff6/1834021052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a51ba267-ef97-41d6-818f-df3c23997bed/loreseva.pdfIn PDF document text
    • http://riluromeni.epizy.com/math_worksheets_for_5th_grade_order_of_operations.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_fb45523d804b4546ab63ec55183c4cd5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8697429f-f879-4dee-ad32-b7abe5c6cc93/gaxafenujigiwujoru.pdfIn PDF document text
    • http://xupewurabef.epizy.com/jedaturozojunetetip.pdfIn PDF document text
    • http://nonavijewiw.epizy.com/86824259472.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_2fa0c266ed6b498e9dfe7d9b6485f95e.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 5168 bytes
SHA-256: a5b8eb53baf6c97ecc5f2482d7e1641a40ba2206d4466466095c2bd3a45a738e
font_01_sfnt_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 11188 bytes
SHA-256: ef822b2035d1a5b08943e2362ecd819f689e1cfc51ecba17fbafea9e18f851ff