Malicious PDF — malware analysis report

Static analysis result for SHA-256 30babc61b8155a9f…

MALICIOUS

PDF

76.3 KB Created: 2021-04-19 09:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 88da8f34277888b8089ea92093509a6c SHA-1: df56829b5ab309125760c45a4a580a1332bc79db SHA-256: 30babc61b8155a9f64d7dc08a503cb43d9d45616694a7f0a1e621a4f35552256
126 Risk Score

Malware Insights

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

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 5

  • 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 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://nipisod.ru/strik?utm_term=what+is+the+theme+of+the+story+the+two+brothers PDF link annotation
    • https://cdn.sqhk.co/mezomabesoki/iiEhaic/japanese_hiragana_trace_sheet.pdfIn PDF document text
    • http://nasporte1.fun/bofetisozz6arv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416316/normal_604e45c941b4b.pdfIn PDF document text
    • http://kuxufijum.iblogger.org/48009260265.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/6jb0lji/26533885161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455657/normal_604d0706bffa3.pdfIn PDF document text
    • http://urott-hu.com/3847269173883u6f.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/eUgil2m/89625275916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453908/normal_60194d5a0ac24.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/ggSzjgX/idle_slice_and_dice_mod_apk_android_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pamiwumewamem.epizy.com/bio_rad_cfx_manager_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/application_of_computer_in_business.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/bakigetazuruva.pdfIn PDF document text
    • http://wokupubax.epizy.com/how_to_write_an_appeal_letter_for_university_admission.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/182ef7df-8ccf-45d4-9d1e-3e5efa2672f1/what_is_the_function_of_chlorophyll_in_photosynthesis_for_class_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59fd8f78-90fc-4e98-b93a-3342ad913ab0/the_lake_house_2006_explained.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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 5320 bytes
SHA-256: f135269c95d79a2e55baabf37fbed3b1fae55430b09c50b1b594cde6fd9ec246
font_01_sfnt_off0000fe9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9D 10876 bytes
SHA-256: fca7d03565ae41350c9dae6069625efd3e37f13121fce74a1d751614c69aa926