Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c203afa0a11d517…

MALICIOUS

PDF

90.8 KB Created: 2021-03-01 21:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e02a259a1083420ad02caea67f6fad02 SHA-1: 9f6f3c97b7e88baa7c06dafbeb6b92ada5da741f SHA-256: 3c203afa0a11d517cc823841fc21c73a9dec168e4e2e957929c849dcc32929a9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable hosting services. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wix?keyword=constitution+of+india+and+civil+rights+questions+and+answers+pdf PDF link annotation
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/6353159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505096/normal_6013e33ed070a.pdfIn PDF document text
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/kamesul.pdfIn PDF document text
    • https://burevojaziji.weebly.com/uploads/1/3/4/7/134729690/1f9c55a797.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477637/normal_5fecd41749767.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425910/normal_5fdd728d7b468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462344/normal_6032ce44c7539.pdfIn PDF document text
    • http://xekedibu.iblogger.org/thermal_nitrogen_oxide_formation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_60248d5fdda05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490263/normal_6035ab4a4e498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_6031d171ea1a7.pdfIn PDF document text
    • https://pusesame.weebly.com/uploads/1/3/4/6/134662227/metarixo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390659/normal_602e39f77626e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411250/normal_5fd39a92e8813.pdfIn PDF document text
    • https://tugesarafexo.weebly.com/uploads/1/3/5/3/135319839/5954822.pdfIn PDF document text
    • http://subaxidubuju.22web.org/marine_corps_workout_plan.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tidinofo.epizy.com/ozark_trail_14x12_screen_house_instructions.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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001082f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1082F 7836 bytes
SHA-256: 05b572f90889f75def904505b0ee6f683ceec91f35a6199ec80586e61208b634
font_00_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 5600 bytes
SHA-256: 57069e57e2f027510d1f06dcc0c92e41ecfa974fb1781ebd4cff13c7f2af6ccf
font_02_sfnt_off0001234e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234E 10700 bytes
SHA-256: d8cae8df098a444c79a5f212982dffa8e326a86542b88ca679cc186399a85892
font_03_sfnt_off000147ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147ED 16096 bytes
SHA-256: 9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61