Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab9fd9bfff14908…

MALICIOUS

PDF

88.0 KB Created: 2021-01-23 16:11:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: aa6a2ef2d52828d1fef8c510ab4224ff SHA-1: 70258ef97e566175f3bae0b8436396a2099c5a92 SHA-256: 2ab9fd9bfff149088391454d9ca4d5d0f4aba809334b0c4f2cd8009a0aab0181
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, characteristic of a link farm or phishing attempt, directing users to various websites. The document body, though heavily obfuscated, suggests a lure related to "wise african proverbs" to mask the malicious intent of redirecting users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/aws?utm_term=wise+african+proverbs+pdf PDF link annotation
    • https://piwobovolan.weebly.com/uploads/1/3/5/3/135388479/4cc458ab0a2.pdfIn PDF document text
    • https://site-1234129.mozfiles.com/files/1234129/the_five_kingdoms_of_living_things_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417983/normal_5fcc61e51688b.pdfIn PDF document text
    • https://site-1260537.mozfiles.com/files/1260537/wiwedogogukozotomewa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474989/normal_5fe140d60ecb9.pdfIn PDF document text
    • https://site-1246938.mozfiles.com/files/1246938/autodesk_insight_360.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424672/normal_5fd03c375f35e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387566/normal_6000fc434f12c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475208/normal_5ff5e0666176c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478408/normal_5fe24c978f33c.pdfIn PDF document text
    • https://site-1210486.mozfiles.com/files/1210486/backstreet_back_alright_song.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/pipaneku/nimiwupevebamajawubujaxuk.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/fusegelakixag.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/lovadebufogidotuguvij.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/avion_flight_simulator_2017_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/2018_answer_key_gate.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/sql_server_2016_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/b1_archiver_app.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/26693602249.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/97808518807.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_off00011b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7C 5328 bytes
SHA-256: 61b2e000ec1c2ea3c65d74a81af6b8cb8a4940e7eb58d938cc32bbf270f0b590
font_01_sfnt_off00012dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBC 10788 bytes
SHA-256: b8d573728e308d804b7eaff242f34b14d011a81dfc500d3780eff439dc542106

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