Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2009b66f77c96b…

MALICIOUS

PDF

101.7 KB Created: 2021-03-29 03:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3674ede98136413b916737536b33efa9 SHA-1: 8108b26afb1a101be46e8e34bc2abac679436039 SHA-256: 1b2009b66f77c96b35b91e24439010d4d0a7dc0cff7fd4d9913545ef64a61543
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=hack+coin+master+2020+iphone PDF link annotation
    • https://cdn.sqhk.co/kizulajeli/lmGCgeL/83537696631.pdfIn PDF document text
    • https://cdn.sqhk.co/zudoputasafe/3pBgdjf/middle_school_science_trivia_questions_and_answers.pdfIn PDF document text
    • http://gatorama.space/redirajs3y8a.pdfIn PDF document text
    • http://fbcopyright-center.com/gojulurejak7qz6a.pdfIn PDF document text
    • http://pubgucbayim.com/tamao_de_una_ficha_bibliografica_en_wordrmbsp.pdfIn PDF document text
    • https://matixibufi.weebly.com/uploads/1/3/0/8/130873880/demitozovi.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/lhghahb/sojojewegibaxamikiwit.pdfIn PDF document text
    • http://biweekamnf.com/639351894072jv5q.pdfIn PDF document text
    • http://netlysy.online/719475598323tcu4.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/edf83156acdb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://robefopatobut.epizy.com/91026493095.pdfIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_129d501cbc9843a98861e0990ff8659c.pdf?index=trueIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_1c31db4b28b94763876ff81cd0b5bdca.pdf?index=trueIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_7ddb9c9d55bd435f9f65f049c39dcee2.pdf?index=trueIn PDF document text
    • http://vojitexaruwulo.rf.gd/22885399387.pdfIn PDF document text
    • http://nataxos.epizy.com/wifi_authentication_problem_in_android_phones.pdfIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_5c6c773c3f304fd8bebce024cb77c396.pdf?index=trueIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_2981604ff291430bac0b18c681f6be52.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001341e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341E 5440 bytes
SHA-256: b312e07f7caa896718b5aa76c10a341512e2b151fea274f530b26e9384b57530
font_01_sfnt_off0001466d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466D 13952 bytes
SHA-256: 63000f762f305aea3ac477dda38afbbf1425a1c17281b9efa7b3bf5500b6e911
font_02_sfnt_off0001738f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1738F 16268 bytes
SHA-256: 9667589eed20f1ec2e98471885854abb1d17b713722dc1c69c8b0eef9690b5b3

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