Malicious PDF — malware analysis report

Static analysis result for SHA-256 defc64a6c8a79128…

MALICIOUS

PDF

87.5 KB Created: 2021-03-15 12:11:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b6cde8f3b4d849195dd2729907acbbb2 SHA-1: 1b667ecdf7c2aab5983f02eed273265106fdfb5b SHA-256: defc64a6c8a79128ff23e770388ac3d3d3b4f0f3a709cba19cf6ac802cb20221
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to disposable hosting and are likely part of a link farm designed to attract traffic. The primary malicious URL identified is 'https://midufefew.ru/strik?utm_term=masters+in+international+business+salary+in+uk', which is likely used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

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://midufefew.ru/strik?utm_term=masters+in+international+business+salary+in+uk PDF link annotation
    • http://lnstagramverifiedbadgeshelpcenters.net/54832054752alv9n.pdfIn PDF document text
    • http://takinodexitimax.22web.org/download_surah_yasin_ayat_72.pdfIn PDF document text
    • https://vivuwugo.weebly.com/uploads/1/3/0/9/130968913/padutogakuj.pdfIn PDF document text
    • http://podarokinsta.online/jogobepenosazimiwesimikev0ocv.pdfIn PDF document text
    • https://memekofonaw.weebly.com/uploads/1/3/6/0/136054412/24f443eed88.pdfIn PDF document text
    • http://juilopkiretlo.ru/vocabulary_building_downloadorr36.pdfIn PDF document text
    • https://xexibufit.weebly.com/uploads/1/3/0/7/130739933/f7f982d0ae.pdfIn PDF document text
    • https://wipedevibenisi.weebly.com/uploads/1/3/5/3/135315865/6be0e67e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f29b9324-5cc6-4f89-89da-c370c3ace4b4/4141232380.pdfIn PDF document text
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_a3d2e9bebe5947cdbba42a99f2638eb2.pdf?index=trueIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_a034dba0fd6c486f88004dd72e4a47a8.pdf?index=trueIn PDF document text
    • http://tifolerame.epizy.com/how_to_change_air_filter_in_kenmore_french_door_refrigerator.pdfIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_a93550bc03784a15a01fb31639adf3ca.pdf?index=trueIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_78f3248e5cb043058a4375cba678c0ba.pdf?index=trueIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_a1efa2efaf71435faec5b6fd8a4b6fc2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f47061e-2c11-4f43-88da-6b397e6f0fdc/73855132784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9bab4fd-b0ab-44fe-bed3-919c17b38ec3/doripu.pdfIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_a00302b0636a477186722957673b3dd3.pdf?index=trueIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_b042925a3840478bbe02542df1fef921.pdf?index=trueIn PDF document text
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_b60a55e91e054261b5afde953c0f9d3c.pdf?index=trueIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_85b6758cc8e943b0bc42e41f7af8c6b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/611223a0-5a51-4311-8d9a-2a1b5484bc6a/65765618661.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_off000115c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C9 4988 bytes
SHA-256: de4b3a57f1533ea8217fb0e91fe5129f592445ec5f740807d8d4cc1d15b44949
font_01_sfnt_off000126e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E5 11552 bytes
SHA-256: 15bdc4a0054dc9b0003756044e8310803a45eb09d3a468b4d98e2d79c55148ec

Open this report in the interactive analyzer, or submit your own file for analysis.