Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a40df6da500861c…

MALICIOUS

PDF

77.3 KB Created: 2021-03-29 22:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c53e87b3455e8f3b67c6b820006e5f03 SHA-1: 25844f651e877a74896580ec484c3273459b6136 SHA-256: 9a40df6da500861cdd5ca722a19458c2f1dfaf75a339cf77ef790463f4837a84
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, including one pointing to 'xezojetit.ru', suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains keywords related to medical treatments, likely serving as a lure to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=autoimmune+hemolytic+anemia+treatment+pdf PDF link annotation
    • https://cdn.sqhk.co/letonolomo/gjBSJge/choice_of_the_vampire.pdfIn PDF document text
    • http://vavesojijakoju.iblogger.org/auto_transformer_starter_single_line_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/ibkxBij/52229483750.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/irZ4HN5/gaderuwojikudot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kufazete/tegutukemigezotifusis.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/free_happy_birthday_card_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/dewolejulumof.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/cido_ciandrico_formula_estrutural.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/informed_politics_gw2_locations.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/96875219302.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/waraf.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_f6a0afe26757446293cf42378e13944f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/would_you_rather_questions_guys_dirty.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/13490402459.pdfIn PDF document text
    • http://sigadoba.epizy.com/what_is_penal_system_in_sociology.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_d7d87eac9c4e47d5aa85a44dc24e0fd0.pdf?index=trueIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_21248e3b50f3474a9e2f1bc717374891.pdf?index=trueIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_a24d8e301ba64fe9989642cc2c08be9a.pdf?index=trueIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_4035318da823481392a183482313d7d3.pdf?index=trueIn PDF document text
    • http://taxowojo.epizy.com/genekonadejaf.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/f_secure_freedome_vpn_apk_premium.pdfIn PDF document text
    • http://worazuwimitital.epizy.com/9th_class_social_textbook_english_medium.pdfIn PDF document text
    • http://kututugijama.epizy.com/cursive_writing_a_to_z_worksheets.pdfIn 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_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 5308 bytes
SHA-256: 37c6d60cdeaeb23fac5130967e4c20346dd0980840afd6c5deb22dff1a71279b
font_01_sfnt_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 11592 bytes
SHA-256: 147829f15de6ffd03c36f6ee3d8d864bcca77ecf66cf8fd91a94502792bdc0dc

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