Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88816061dfee356…

MALICIOUS

PDF

107.4 KB Created: 2021-01-21 01:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 207cb9f2a2c5ae64aeb0fdb8089c9b81 SHA-1: ba5237cf87b806fe4962fd64612d5ef6697db083 SHA-256: b88816061dfee356760fcd38209ef694837c9245e9a7f77e1e5fee7575473f97
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with the primary URL pointing to a site that appears to be related to movie hits. This suggests a phishing or ad-revenue generation scheme. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://jottigo.ru/123?utm_term=2018+telugu+movies+hits PDF link annotation
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/livepexad-wesev-lunuvojovotir-jirofuse.pdfIn PDF document text
    • http://talezoruvaje.iblogger.org/best_4k_movie_app_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420767/normal_5fcc4438efc6d.pdfIn PDF document text
    • https://bufopavebusi.weebly.com/uploads/1/3/4/8/134853568/b7a37b584.pdfIn PDF document text
    • http://masimepipet.22web.org/20885257776.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://s3.amazonaws.com/jebupofedijakuk/82584031887.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/amazon_web_services_tutorial_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/auto_collision_reporting_centre_oakville.pdfIn PDF document text
    • http://tesoxukezeziles.epizy.com/vikaborufa.pdfIn PDF document text
    • http://javasuk.epizy.com/walmart_logo_vector.pdfIn PDF document text
    • http://nesowoxaxisaxa.rf.gd/conjunction_worksheets_for_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/annelids_mod_apk.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
    • 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
font_00_sfnt_off000140f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F0 5052 bytes
SHA-256: f45fc47ffe4d03935e4fb9ba77273970e7c490f67be4116ff86885b394960df4
font_01_sfnt_off0001522e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1522E 12844 bytes
SHA-256: a684c71b611df97c623b8acd976ad80412490832955cadd4b8fc9e05b6663037
font_02_sfnt_off00017ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BA1 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e
font_03_sfnt_off000190b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190B6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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