Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f00192d33ed75c9…

MALICIOUS

PDF

78.0 KB Created: 2021-03-21 21:36:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d2f269899544ba3c25c9484298d04aa1 SHA-1: e20996e3867d6475ed00480cb31b35ef4f55abac SHA-256: 0f00192d33ed75c95fdc49322fa51d2fb7066abb49e1fbf4ab71c03d39d47c1d
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains keywords related to financial mathematics, likely serving as a lure to disguise the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/aws?utm_term=ejercicios+resueltos+de+matematica+financiera+interes+compuesto PDF link annotation
    • http://pinerapidsrr.com/sasuxubofawatububaluvuzq8pnh.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/installing_sub_zero_door_gasket.pdfIn PDF document text
    • http://magnifioco.site/environment_and_you_christensenf4znr.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/42807734661.pdfIn PDF document text
    • http://springtea.space/2013_nissan_juke_repair_manual0awuy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_759a48c72e8f451698cb0e549d86f6f4.pdf?index=trueIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_0654ac30c114489ebfa210a30f4be97c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/514b67c3-b879-435e-be9d-82732ebbb7af/how_to_use_kitchenaid_chopper_attachment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e0c015-d2c9-4cd6-94cd-4d37894d328e/xejesap.pdfIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_8d24e38cb8094900b0aac18f1daa982e.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_c2585d8c876d4043b6aa227c7adea887.pdf?index=trueIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_02dadbf592c448e4b91adf071cde92a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2858bb-da23-448a-bc1b-166c325f86b7/xegudapepamanobodu.pdfIn PDF document text
    • https://f621ecf8-e26c-4db3-9bdf-176eeceb312d.filesusr.com/ugd/b3755e_ec31177f55614170aa3a0cb619b43167.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc23a3d1-913e-40b9-b62b-f5b46320e102/27756923320.pdfIn PDF document text
    • https://df1d5e35-4e67-4e57-ba41-6141a32c4ecb.filesusr.com/ugd/c54278_d27c2c27b1294a22acd30809e8883223.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_4276ca821a844728a1b5cd4bb870c098.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e4370d-424c-47b7-ac11-d9503cdad3dd/43422901148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9355ba-8636-422f-afae-33c1977a7ac1/pl_sql_developer_jobs_in_chennai_for_experienced.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d13064d-35a2-4ee3-b60d-83a0742e6b59/jusikizuwozofirep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 5216 bytes
SHA-256: 80e0b8e18002de0b037a215f504b360a1516f80db57f94ca630a9f534ad07ed2
font_01_sfnt_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 12088 bytes
SHA-256: 3ea0ea683fe2c64af6fe16f174b396ddb8d3a67d47ea6275a9cba927f95a2160
font_02_sfnt_off00011a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A17 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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