Malicious PDF — malware analysis report

Static analysis result for SHA-256 c290901da939c72d…

MALICIOUS

PDF

83.4 KB Created: 2021-04-01 13:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 71208bd78254eb25ae723ccec557362d SHA-1: e42527d0906441548b4d535b3e3ccfeba43b0ec0 SHA-256: c290901da939c72d900b180c73c7f96a1dc77b311510bdf2b8892df6a9bf207f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. The embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/award?keyword=standard+costing+system+pdf PDF link annotation
    • http://natlegend.space/10353307249wakvb.pdfIn PDF document text
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/6770428.pdfIn PDF document text
    • http://aycotoro7.xyz/knitting_hat_patternsq1lvz.pdfIn PDF document text
    • http://navalny.design/what_is_a_blind_nil_in_spades_plus4gvbb.pdfIn PDF document text
    • http://islemleriniz.org/37379346193qyaef.pdfIn PDF document text
    • https://zanirifut.weebly.com/uploads/1/3/1/4/131407922/vobenuma.pdfIn PDF document text
    • https://kukitame.weebly.com/uploads/1/3/1/3/131379641/guzaduz.pdfIn PDF document text
    • https://nagugopusoz.weebly.com/uploads/1/3/4/6/134645600/pumetijabo.pdfIn PDF document text
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/8a383f33c.pdfIn PDF document text
    • http://effektzhizni.ru/combat_bull_rush7rlfc.pdfIn PDF document text
    • http://mavito.online/google_chrome_offline_installer_latest_versionjk53e.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/292d436c-e4cd-4033-a845-b5ab538423ec/18039507840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4255a7-900e-46be-b0fb-910b9572dac4/best_horus_heresy_legion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c2c856f-6316-4250-8340-f46a9603f214/what_is_the_best_kitchenaid_mixer_to_get.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49aa51c5-a2cb-4fbc-80f2-335798688b34/rugewomum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20076bc5-fd36-482e-a735-b8ab696fa581/wapapomebujozop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89acd1ef-8500-42db-8d00-ea2048378a7c/4457721235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/003be205-3525-44a7-afba-55b76a88d3e8/tuck_everlasting_worksheets_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f186f94-cdef-4b9c-8777-ad1781a0ad68/realtek_audio_driver_headphones_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f64be71-3c40-409e-beef-87d4b8676cac/xaxosavalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d838d52-defe-4df4-b122-b7f3c4778051/dejumapurabezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c8bf639-98a1-4de8-ae6a-3e534eb8d0e4/why_i_am_not_a_hindu_summary.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_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 5648 bytes
SHA-256: 296f6c9bad4cc503540f7051c5fe494d072d22a670a43a20b5c4169f91ce321d
font_01_sfnt_off00011b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0F 11040 bytes
SHA-256: 47ab749c94e3d54485111720b0214c70d847a9cca78c02b4d896931fd628d65a