Malicious PDF — malware analysis report

Static analysis result for SHA-256 f526d7507451c571…

MALICIOUS

PDF

93.6 KB Created: 2021-02-21 11:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 02e52ddb827fe513242e0fbb6a741445 SHA-1: 82f9368ade0368ad35aec13c0714e35393b54a9a SHA-256: f526d7507451c571e74d56e484e4dd58dd99aef95e8f5d98cf2c20db7c3322bb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are structured as link farms. The document body, though heavily obfuscated, contains references to 'psiphon 3 apk for windows', suggesting a lure for potentially unwanted or malicious software. The presence of many distinct domains and the structure of the URLs indicate an attempt to distribute malware or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://seumenha.ru/wix?keyword=psiphon+3+apk+for+windows PDF link annotation
    • http://circleshtang.xyz/ginanoysbbn.pdfIn PDF document text
    • http://vawigeg.22web.org/cutting_plexiglass_sheets_with_dremel.pdfIn PDF document text
    • https://jelonuzekuxenu.weebly.com/uploads/1/3/2/8/132814084/3596744.pdfIn PDF document text
    • http://salonvarna.com/fundamentals_of_corporate_finance_11th_edition_ebookqmyjt.pdfIn PDF document text
    • https://gotowixupin.weebly.com/uploads/1/3/4/3/134393593/nepisavaruli_silenosowu_vusimelu.pdfIn PDF document text
    • http://idealicaitalia-official.site/sejenido8t319.pdfIn PDF document text
    • https://sarerudaguf.weebly.com/uploads/1/3/4/3/134373173/fizapalulugi-banudax.pdfIn PDF document text
    • http://freshka.fun/kipimikupakitutz8.pdfIn PDF document text
    • http://organic100.fun/temple_run_game_2_video3aoj5.pdfIn PDF document text
    • http://craftsmansmetics.com/zisexilenotizudi8kvno.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/68dee8f2fdba.pdfIn PDF document text
    • http://bigwin-1xbet.fun/igneous_rocks_formation_worksheeth8dan.pdfIn PDF document text
    • http://runmasten.online/segilufawomodepzo0q1.pdfIn PDF document text
    • http://foodguideblog.com/gelenubikijudaremekakavsfeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://vumafovixono.rf.gd/banulotifukevovepe.pdfIn PDF document text
    • http://xodolipifonabo.epizy.com/calendario_epidemiologico_2018_peru.pdfIn PDF document text
    • http://fuvogixerad.epizy.com/85146791606.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00014f5a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14F5A 17276 bytes
SHA-256: 189671195e816a1e428ebda2cd8ef7fb047ac7e591d093c1ea77314a4d9a5c2e
font_00_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 2984 bytes
SHA-256: 218615c96ca80467247facc766f9c2f2584948c92711c8aede41886f3cdaaaab
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 5420 bytes
SHA-256: 8c3bf94dcffe00330f40ce454c51880fde5043daba377976841ae38f238713a4
font_02_sfnt_off000114df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DF 6640 bytes
SHA-256: eca62b72654736461a635ba366d09d794777fd95c58152d2b251becdfce657e0
font_03_sfnt_off0001267c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267C 14400 bytes
SHA-256: 00276d9fd89de5fcc5fd21e03cc5d0a2ae936513f4743ef0e079d118e436f4ee

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