Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7de81f4d5d2085…

MALICIOUS

PDF

83.1 KB Created: 2021-04-01 23:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cbdb7b9a4bfcf8e2ac36fd0bb50f6593 SHA-1: 7f1993aab386bc42c34492ab8ddb447159429a27 SHA-256: da7de81f4d5d208586b3a4456429e970f8ecf5d1884b2486f477510a8f8496e2
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains numerous external links, including a primary lure at 'https://resalured.ru/strik?utm_term=star+wars+visual+dictionary+read+online', designed to deceive users into clicking. The document body is heavily obfuscated, but the presence of external links and the overall structure suggest it functions as a link farm to facilitate phishing or malware distribution.

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://resalured.ru/strik?utm_term=star+wars+visual+dictionary+read+online PDF link annotation
    • http://magic-spring.com/how_do_you_learn_lockpicking_in_thief_simulator2h24y.pdfIn PDF document text
    • http://xigujawuruwuko.22web.org/80039539540.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495685/normal_5fcc20e21e52b.pdfIn PDF document text
    • https://cdn.sqhk.co/towafeniruje/ijpdBJf/nfl_news_covid_list.pdfIn PDF document text
    • http://lekejikepaxavex.22web.org/38103971862.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412606/normal_5fc7aeb9113ce.pdfIn PDF document text
    • https://cdn.sqhk.co/sabepakofo/e7VRThi/cbse_class_8_social_science_notes_geography.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481699/normal_602925b2baf10.pdfIn PDF document text
    • http://1green.space/my_airtel_video7jnrx.pdfIn PDF document text
    • http://kraftmann.su/abcd_2_telugu_full_movie_mp4j6ze4.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/gEiRkjj/78085453704.pdfIn PDF document text
    • http://kapunogukak.iblogger.org/30957737235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481065/normal_5fc842e19b110.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_c9fb8741f8564832b61b1ad581ff0912.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xozeb/diary_of_a_wimpy_kid_the_long_haul_jeff_kinney.pdfIn PDF document text
    • http://naluliwuv.epizy.com/xozalinesibojiso.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/bean_sprouts_nutrition_information.pdfIn PDF document text
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_23ebd29d443a49f8a2fca3e78a3dded9.pdf?index=trueIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_e34d864d3ec448f89757251531c729cb.pdf?index=trueIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_2fd79412761e46f8ae42b376628998e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gopuze/nexag.pdfIn PDF document text
    • http://rowavironipomiz.epizy.com/dinukudaguxedivajid.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_off00010894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 5288 bytes
SHA-256: a00d396a5f9a0a78a678e4d2e30bce599711e04ebe5b5ae7c87ead0484ddc356
font_01_sfnt_off00011ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 10628 bytes
SHA-256: efe71d27dcb04a3462684baaafae6df19a4f500322a60de45fa52eb20c44bca0

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