Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1c28bcb69d2d01…

MALICIOUS

PDF

69.2 KB Created: 2021-02-18 04:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6a0fe2b1280cc5698aaf6b37c87b0028 SHA-1: e179699cda661d964a17377711791b06e97d9ebe SHA-256: 9f1c28bcb69d2d015d4df4dfd16fc623721eba8809dba26495b1716b63d38176
154 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious websites. The document body, though heavily obfuscated, appears to be a lure related to a common mobile network issue. The presence of a malformed active-content stream and ML classification strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://leonvi.ru/strik?utm_term=why+is+my+phone+saying+not+registered+on+network+virgin PDF link annotation
    • http://secret-empire.ru/injury_report_chiefs_chargers4s7ta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_60297b34af70c.pdfIn PDF document text
    • https://jajufuwupu.weebly.com/uploads/1/3/1/1/131163717/5492486.pdfIn PDF document text
    • http://fruitik.space/how_to_send_flirty_text_messages_to_a_girlent3q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_601fa39219954.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/subiwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379483/normal_5fe00fc3c31cc.pdfIn PDF document text
    • https://cdn.sqhk.co/ruduligived/hhhgg5F/82244497003.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/657790940594czl9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_5fe6211db22f2.pdfIn PDF document text
    • https://zuzuvisaze.weebly.com/uploads/1/3/0/7/130738998/0acd5b2eabfab2c.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/watajive/damofogoxipulileboxixu.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/insolvency_service_ireland_guidelines.pdfIn PDF document text
    • http://zanavaf.epizy.com/xavejexupesig.pdfIn PDF document text
    • http://wapowidomuf.epizy.com/82675832110.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/ssc_mts_answer_key_2019.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_off0000d133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD133 5672 bytes
SHA-256: 9ff048b07127db7808265ed3d367edc38cb97857dd8198d77678dbe47bd4afdf
font_01_sfnt_off0000e477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 10280 bytes
SHA-256: 219142d20c714b3a04bf46790e6019942003e2494e45a5d8d20420103bc4448f

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