Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d31971ca97f848a…

MALICIOUS

PDF

80.7 KB Created: 2021-05-14 21:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93df2105bce187cf315bee9db76b17a1 SHA-1: 4c36b9faa8d3cd4ad6852d9b67a19f621266e8fe SHA-256: 6d31971ca97f848a91bce10c761fc60686ba5635bb3731064a317ccff61eb2b5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent external URI, 'https://xezojetit.ru/strik?utm_term=how+to+sync+my+polk+audio+subwoofer', suggests a lure to a malicious site disguised as a search result. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=how+to+sync+my+polk+audio+subwoofer
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/8865063.pdf
    • http://generatorsale.ru/capital_markets_institutions_and_instruments_free_download4ra25.pdf
    • http://kyhni.site/android_google_manager_7p0qfr.pdf
    • https://tuxufinuzeleki.weebly.com/uploads/1/3/4/7/134737217/3e2e39de42c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dikobepibelun/denirit.pdf
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_1d937822280543e388bb05e200bf1da5.pdf?index=true
    • http://pujupapisosu.rf.gd/duvakujoxuvo.pdf
    • http://dodekogizur.epizy.com/free_birdhouse_plans.pdf
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_ad2a022b4f814d93a5dcbe9914376b7c.pdf?index=true
    • http://gilokokivaw.epizy.com/17206262054.pdf
    • https://s3.amazonaws.com/punagilelabon/mejog.pdf
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_0e55dcccea2f4e109767eeb29cf374bb.pdf?index=true
    • https://s3.amazonaws.com/niwotipugonuvoz/nixasukinalebobilimevaxim.pdf
    • https://s3.amazonaws.com/muvemasoxaji/kuwamadur.pdf
    • https://s3.amazonaws.com/jarirotexab/butogivikeliwijolelimo.pdf
    • https://ff5ab256-a407-4697-91b9-141751226614.filesusr.com/ugd/4205e4_e433431e677d46c2b4c15cd44db700af.pdf?index=true
    • https://s3.amazonaws.com/kavalukato/free_weekly_planner_2019.pdf
    • https://s3.amazonaws.com/fivebo/4737752254.pdf
    • https://s3.amazonaws.com/nademopor/zedos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f381.bin
580d8fc6024f2c6ee3ea982dc99692acdfeab1c87742f10bb364e8de1817d546		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 5660 bytes
font_01_sfnt_off000106b3.bin
6f697eee7bf37784bb446425e1f979786c3cca52c2305ed2c75c26a94be2c1f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 1824 bytes
font_02_sfnt_off00010fa0.bin
bc710f7a3c24d638afcebd8212f1cc283fcbbcaf932f85bd4331ebe6ba624301		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 10900 bytes

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