Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc4d2d5f730ded0…

MALICIOUS

PDF

82.0 KB Created: 2021-04-04 01:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c892e6366b1ab52d8f3d120ad6b68216 SHA-1: 585f4c8f83559576d1880aee54f49a8a21e8364a SHA-256: 5bc4d2d5f730ded000de3c50cb1da565476c6253cc70fa8bc7f5f115271ba6b2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://resalured.ru/wix?keyword=aggramar+heroic+guide PDF link annotation
    • http://testvvd.xyz/jodugoramitapiu9y0v.pdfIn PDF document text
    • http://xplaintome.ru/puzodoluwajemavakibeunw5l.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/1997_yamaha_timberwolf_250_4x4_specsbq3q7.pdfIn PDF document text
    • http://lavka-karamel.ru/ravalavegevatofaboxou3ufa.pdfIn PDF document text
    • http://lnstagramsupportlives.com/melizolixorepelutofiy95zo.pdfIn PDF document text
    • http://merishwheelrecords.com/what_are_the_stages_of_hip_arthritis3jhqn.pdfIn PDF document text
    • http://flowerport.shop/68326280143634p5.pdfIn PDF document text
    • http://hangookoil.ru/clair_de_lune_ukulele_tabku4a7.pdfIn PDF document text
    • http://reduslim-ordina.site/peer_gynt_composer_nyt_crosswordc36r4.pdfIn PDF document text
    • http://kfcrabota.ru/59566548258dhmfo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_90d78f05a9454dc996dabc1bfa40678b.pdf?index=trueIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_5db1ee09ac7b4768b7ebed1d82579fc9.pdf?index=trueIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_f81d1c843da24a3aac352546c87178d6.pdf?index=trueIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_9924b416288f4e05b9b9b616211bf313.pdf?index=trueIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_d58c2c6ce03941e48c3c2e5a29cf787d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/calculus_books_for_college.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_52bd7874106843e9b598a17535cf814e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/bricks_and_balls_hack_apk.pdfIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_592bdc73191149ae93ea79478ec2b970.pdf?index=trueIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_6b8579a48dc04bbc816935d524debf80.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_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 5132 bytes
SHA-256: 84b9665a659ca67270f3a1a941483c44c90f4de0d43ab9aed0854cd0757aaf85
font_01_sfnt_off000115a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 10940 bytes
SHA-256: 4899f01636ff3567df742f190ea6358e8405a06de278081857088eeee7a7869b