Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb42040d08384db…

MALICIOUS

PDF

95.2 KB Created: 2021-03-18 05:22:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 312e262012977d0a939627bc95c8881e SHA-1: d22a318c4b48930659503fa72594d349bc4685ee SHA-256: ccb42040d08384dbbf29deb8afba04aa9e242d9a607262dbdc327e1527b648d1
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the use of disposable hosting for linking to other PDFs, a common tactic for distributing malicious content or conducting phishing. The document body, though heavily obfuscated, contains keywords related to 'calibration curve method pdf', likely a pretext to disguise the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/award?keyword=calibration+curve+method+pdf
    • http://worameruvejaka.mywebcommunity.org/mala_absorcion_de_proteinas.pdf
    • http://fovorowo.22web.org/plural_form_of_compound_nouns_exercises.pdf
    • https://ganepivojo.weebly.com/uploads/1/3/4/7/134774155/betavojukuze-pugajipiwek-niwew.pdf
    • https://cdn.sqhk.co/xosaletozobi/ceigzjh/icloud_photo_for_windows.pdf
    • http://13millions.store/58776483405sg218.pdf
    • http://reduslim-shopofficial.site/57536070456f8jg0.pdf
    • https://paguvobidelovug.weebly.com/uploads/1/3/2/8/132815355/nadefewipobozowoja.pdf
    • https://cdn.sqhk.co/berazanoga/hjpighj/canadian_top_40_radio_charts.pdf
    • http://zagavexakagin.mypressonline.com/hepatic_encephalopathy_2020.pdf
    • http://businessoutsourcing.org/natedazaxopunetujdbil.pdf
    • https://liruviwogaralo.weebly.com/uploads/1/3/0/7/130776788/9676864.pdf
    • https://bapamebitisetup.weebly.com/uploads/1/3/4/3/134325238/tozidubirerus.pdf
    • https://cdn.sqhk.co/lenubire/WxyvIge/lologuroxexusaxute.pdf
    • https://cdn.sqhk.co/poronujefino/cih9S4c/wubadeladanapozumitubebi.pdf
    • https://cdn.sqhk.co/bikuloxisage/fiek97y/falling_in_reverse_drugs_lyrics.pdf
    • http://juwupexutaval.mywebcommunity.org/kejasesikivujetiv.pdf
    • http://mmeueue.space/hello_guitar_chords0zyjw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gapojetudijo.rf.gd/livro_dos_espiritos_allan_kardec.pdf
    • http://dozipebijegubig.epizy.com/88965003223.pdf
    • http://xofiketur.rf.gd/cet_2019_exam_form_last_date.pdf
    • http://gakilasefit.myartsonline.com/fakuzisujobuzetozitag.pdf
    • http://tefesapebeto.rf.gd/sql_server_express_2017_full_version.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013746.bin
efc838650156816fa559a1fe966049a4e575982af8222c05a3b62924f06c202e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13746 5324 bytes
font_01_sfnt_off00014931.bin
8c323081369d590cd2e7db4c33d3ea2136c5033686dee3e7251a274dbc9542ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14931 11244 bytes

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