Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd69020fc25a310…

MALICIOUS

PDF

65.7 KB Created: 2021-04-08 00:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 40502ae970f251fa4d05c4f0aeb9fbe0 SHA-1: a344b4bd5565c1938d9af65d8eb7f1f63a8cdcab SHA-256: fcd69020fc25a310d20067beeb5b8f92654d6551f0b80f7dac3d641dd696da47
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URIs, with one specifically pointing to a suspicious domain ('seumenha.ru') that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a 'worksheet'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/wix?keyword=food+for+thought+worksheet PDF link annotation
    • https://vimadefivikimaw.weebly.com/uploads/1/3/4/2/134265378/jugisune_pekokonodek.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/alphabetical_order_and_miscellaneous_series.pdfIn PDF document text
    • https://kapojisu.weebly.com/uploads/1/3/2/6/132696117/dabexudano-pezovup.pdfIn PDF document text
    • http://riniwodifole.medianewsonline.com/99438614555.pdfIn PDF document text
    • http://luwinilulurop.mywebcommunity.org/58337925522.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5fdf6a0c87db6.pdfIn PDF document text
    • https://xoxatazafej.weebly.com/uploads/1/3/4/8/134861408/lebituxonowafav.pdfIn PDF document text
    • http://geparup.scienceontheweb.net/inorganic_chemistry_book_for_iit_jee_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_605a60e4ee62f.pdfIn PDF document text
    • http://natosabi.mygamesonline.org/kiluraderabenopin.pdfIn PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/bacab.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/vekodupiwarobi/google_maps_api._xml_android_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13766a6f-7b85-4cb3-8df3-1e1a755a9485/wuwik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddef217f-87f2-424b-afd1-f9c117ae5c11/gazexazili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fca9737-c3d6-45c8-875f-d1faa0831f1d/pisatafeweto.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/letter_n_coloring_sheet_for_toddlers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd11a0d1-98af-4391-a5eb-bdd42fc6ba7e/82200382217.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/20725704461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5014029-df64-4e93-9fed-9508413dc716/45772947621.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_off0000c67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67A 5040 bytes
SHA-256: 2f54a5334ca2fcb8979436536b1254d8b382cc27aebb732874b4012af6dc61b6
font_01_sfnt_off0000d7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B6 9792 bytes
SHA-256: a725a8a460a489c168dbbca7fad32e4140cb86ad522fa2b1ea7f49984383c7b9

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