Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e35b671e676bd48…

MALICIOUS

PDF

129.4 KB Created: 2021-03-30 23:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c3033303379dc8cee1f40c2c1a0b635 SHA-1: d4974c10f9dcc4a0c49f5b86c77018511daf8c95 SHA-256: 5e35b671e676bd48505d9968a73e99d4dd08a0d58f66a7e3fff59f23ae0d5133
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one specifically pointing to a suspicious URL that appears to be part of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=soundarya+lahari+meaning+and+benefits+in+telugu
    • https://musekakilex.weebly.com/uploads/1/3/1/4/131406804/a979742.pdf
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/kifigowez.pdf
    • https://difodofixipa.weebly.com/uploads/1/3/0/8/130814112/femovege.pdf
    • https://xidoferowugefu.weebly.com/uploads/1/3/4/3/134348033/17952c4.pdf
    • https://vulopinuvi.weebly.com/uploads/1/3/1/1/131164419/fefaxuwur.pdf
    • http://xilagima.66ghz.com/kozanetovigalozano.pdf
    • http://jenerotisa.mywebcommunity.org/sijakutifen.pdf
    • http://tigesonepovar.66ghz.com/adding_integers_word_problems.pdf
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/265674.pdf
    • http://detonicinitalia.website/525120382947cu1u.pdf
    • https://wivovisewisapu.weebly.com/uploads/1/3/5/9/135963584/857060.pdf
    • http://sovuradema.medianewsonline.com/atkins_quimica.pdf
    • http://sabewasarakabi.iblogger.org/is_cosrx_salicylic_acid_cleanser_good_for_sensitive_skin.pdf
    • http://tersq.space/properties_of_exponents_examplestayj8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_aa9772e563c14d2588651a9a59236814.pdf?index=true
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_a47bf933768d4d99a0e000cfa96b154f.pdf?index=true
    • http://kimatun.epizy.com/assessing_student_learning_a_commonsense_guide.pdf
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_5a8e97b2033a42ba95ffb1cc246437ca.pdf?index=true
    • http://zovibeviniga.myartsonline.com/3847925732.pdf
    • http://goramoxoxikaju.epizy.com/present_simple_questions_exercises_elementary.pdf
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_87ac27de701643429eb53eabe032ba90.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a80c.bin
e8aa0853c2cc2b48f4269c9e6582b4fe344585b7bb638c1beb07eb6b4187e39d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A80C 5664 bytes
font_01_sfnt_off0001bb2e.bin
b1495ad589ca2528777c9aebb2354feb64006f2306fa36d9db248ccd15c7a141		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB2E 10760 bytes
font_02_sfnt_off0001e03e.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E03E 16204 bytes

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