Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdea766c25f85e8b…

MALICIOUS

PDF

88.5 KB Created: 2021-03-01 14:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0116ea60fb86b5fe3243f684677993d6 SHA-1: b08d03b556f9d00ce717439c6d93e2a8c4032838 SHA-256: fdea766c25f85e8b5523d3a48b013188f4c27517ae3a4dc2964108bb03bbf136
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to an instruction manual, which is then linked to various disposable domains and potentially malicious content.

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/wix?keyword=metroid+prime+instruction+manual PDF link annotation
    • http://idealslimitalia-ufficiale.site/gatevefomumodozoxabisikopqymg8.pdfIn PDF document text
    • http://info-pages.ru/pif_et_herculepxkvc.pdfIn PDF document text
    • https://cdn.sqhk.co/semejegofip/qqhjghO/green_papaya_restaurant_stockton.pdfIn PDF document text
    • http://ledabojuvogo.22web.org/atomic_physics_short_definition.pdfIn PDF document text
    • http://koteyarn.moscow/swgoh_darth_revan_eventf79tj.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/jBkiche/brain_out_game_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/naritiba/hjb51gj/sakisif.pdfIn PDF document text
    • http://jovupudalapeki.22web.org/tizixowijiboxodadowaluteb.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/oggDThc/uncommongoods_shattered_glass_ceiling_necklace.pdfIn PDF document text
    • https://cdn.sqhk.co/kimamena/GWSjcjf/11272501820.pdfIn PDF document text
    • http://rodina38.ru/pure_apk_install_appell5q.pdfIn PDF document text
    • http://umniashka.ru/lutewiwerevonopelorerj9fi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lutaxipokujopej.epizy.com/how_much_is_the_marlin_model_60.pdfIn PDF document text
    • http://nijetazum.epizy.com/happy_birthday_to_you_chords.pdfIn PDF document text
    • http://sanikivatuma.rf.gd/fofigisodarewu.pdfIn PDF document text
    • http://voperafabekom.epizy.com/adada_malada_cut_song.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_off00011fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDE 5224 bytes
SHA-256: 6be9f2c1fed0846adf6d885906d81934c38d660c46e26a2d538f2e87cab5eee5
font_01_sfnt_off00013195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13195 10240 bytes
SHA-256: 9b872764ce4f63d485142e53767cfa2bfdc8120921f8865f63a36ff323519cd8

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