Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41e999f38bf3dd2…

MALICIOUS

PDF

89.7 KB Created: 2021-03-24 11:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33310a946b9dd9cc398b9556f2c4fde9 SHA-1: dec8a6ee87b5fceb37f8279df713be36dd3ba742 SHA-256: a41e999f38bf3dd2e5573460fca3fca88db6359df8171369729bf7640f18b826
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, particularly to domains like mezovuduw.ru and sarutufasiko.atwebpages.com, suggests a phishing or malware distribution scheme. The ClamAV detection further supports this, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/wix?keyword=bdo+pet+exchange+guide
    • http://ladiluvame.mypressonline.com/biografi_imam_bukhari.pdf
    • http://zepofevof.22web.org/my_talking_tom_gold_run_mod.pdf
    • http://robugipunebib.mygamesonline.org/how_to_list_multiple_possessive_nouns.pdf
    • http://gixapedotamerow.mywebcommunity.org/81083214631.pdf
    • http://faripofijukevom.mywebcommunity.org/29686918092.pdf
    • http://toramomegigex.22web.org/24542663943.pdf
    • http://gemofesane.medianewsonline.com/nazejodazo.pdf
    • http://pofuxubilet.sportsontheweb.net/dijojagiduse.pdf
    • http://rewirujekinoxex.iblogger.org/the_chemistry_brand_hand_chemistry_240ml.pdf
    • http://tideparipawovu.mygamesonline.org/plastic_animation_paper_tutorial.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sarutufasiko.atwebpages.com/bodybuilding_anatomy_1st_edition.pdf
    • https://s3.amazonaws.com/geradi/usa_volleyball_second_referee_quiz_answers.pdf
    • https://s3.amazonaws.com/furunumaroxun/tax_deductible_donation_receipt_template_australia.pdf
    • https://s3.amazonaws.com/pajukovuxetu/20608231082.pdf
    • https://s3.amazonaws.com/jalasilunaz/rojupukozonubukitukodu.pdf
    • https://s3.amazonaws.com/lebejos/duxibazelotosipi.pdf
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_98c3b77d9bf34c74b8d83e701846e15c.pdf?index=true
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_924a98c53f814f18a03b2435e3feee91.pdf?index=true
    • https://198ac300-f2de-41a8-aaa9-2df0d2bfefbb.filesusr.com/ugd/232b71_a3f35ba3ba974c9dbe625db3fad37e71.pdf?index=true
    • https://s3.amazonaws.com/vebisop/mississippi_drivers_license_number.pdf
    • https://s3.amazonaws.com/tinajabizoreguf/adobe_acrobat_reader_for_android.pdf
    • https://s3.amazonaws.com/nimuwet/prime_minister_awas_yojana_form.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
    • 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_off00010a68.bin
eec3f2a3e2d92e1c1e2ba78d7cb6cedb4bfdc9581d3ca26d2a4663681e10a8f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 5144 bytes
font_01_sfnt_off00011bf4.bin
96880deda3f67d3ac72dbde0116f5a7e1c8ae7c7b0fbc1a9a50c4b9a93e07a2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 11676 bytes
font_02_sfnt_off00014410.bin
b91ebbfc40a94f10b2fcfc4d08542e4cd4fc38dcff43bcfefe5d572695fcce17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14410 16160 bytes

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