Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03d40986aa4b733…

MALICIOUS

PDF

75.7 KB Created: 2021-03-17 19:24:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 69bf278088710b96a9893f3cdf79d5eb SHA-1: 58f7ce9f60ca33cf11dadc207a15ff32ed3f815c SHA-256: a03d40986aa4b733f0140adad6e279aeb8e4ef9cd787dc7289b2cd71b2cf5d28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xezojetit.ru/award?keyword=beef+stew+recipes+pdf PDF link annotation
    • https://cdn.sqhk.co/vavusiwi/fQnWLhg/83712745334.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/zulugabexinatugaxozidevo.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/sidetesavapekarasigafoseb.pdfIn PDF document text
    • http://jalojewaga.mypressonline.com/janajur.pdfIn PDF document text
    • http://wedurorokim.mypressonline.com/iso_engineering_drawing_standards.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/how_to_pair_photive_bluetooth_headphones.pdfIn PDF document text
    • http://wabuxon.iblogger.org/radis.pdfIn PDF document text
    • http://zipufofofize.22web.org/live_tv_android_app_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/vPjjIid/captions_for_photos_with_sunflowers.pdfIn PDF document text
    • http://renatoxun.iblogger.org/effective_presentation.pdfIn PDF document text
    • http://pakatisijelu.iblogger.org/optiplex_760_ram_compatibility.pdfIn PDF document text
    • https://cdn.sqhk.co/wexifidobafo/hfhjNih/kisodanivakifumovoji.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/55014308322.pdfIn PDF document text
    • http://zafikapasipugog.medianewsonline.com/putoxanovorot.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/gfDkgdL/kinavonitibiveriluzavi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejegidijikoj.epizy.com/62896708991.pdfIn PDF document text
    • http://wepaxilex.epizy.com/dogepimuvuzolum.pdfIn PDF document text
    • http://wigifanike.epizy.com/autocad_2020_manual_cz.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_d43f4b726d924e76bb3cb6f0719ebab9.pdf?index=trueIn PDF document text
    • http://kigitom.epizy.com/king_arthur_movie_filmywap.pdfIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_b1d02ffb1b2b4d7989d8e91e6e976f96.pdf?index=trueIn 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_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 5048 bytes
SHA-256: b6e0a72509e7c7d18eb2f9da7ac7f313d53e126d918c7790a5807f1a3beeb63d
font_01_sfnt_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 10640 bytes
SHA-256: 5bede083690918ec2341ce9a7b815477ecf14edff20bd70584eb1dc7fc889039

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