Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ddec1341fd59d4…

MALICIOUS

PDF

85.5 KB Created: 2021-03-17 06:05:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 11c74efcad5bfbd01e537bbed7cd9f92 SHA-1: 5f47ee381f52de047f764fe83648f009f7458e94 SHA-256: e3ddec1341fd59d4ad6e70b0fecb6b01c5eec7ebfe5a8dd625310240dba3d294
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'factoring higher degree polynomials worksheet answers', which is likely a pretext to drive users to malicious sites. The presence of external URIs and the link farm heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://golowaki.ru/wix?keyword=factoring+higher+degree+polynomials+worksheet+answers PDF link annotation
    • http://50offstore.info/what_is_a_cash_flow_dealjrw4y.pdfIn PDF document text
    • http://badge-verification-center.com/83856723969p5l3j.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/mifizoviridam.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/advantages_and_disadvantages_of_3d_internet.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/ge_profile_microwave_inside_light_bulb_replacement.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/29469870008.pdfIn PDF document text
    • http://retamos.mygamesonline.org/gifopitasogetu.pdfIn PDF document text
    • http://jushq.club/request_form_for_employment_certificate8pmcm.pdfIn PDF document text
    • http://promooffer.site/diary_of_wimpy_kid_book_serieso496a.pdfIn PDF document text
    • http://callup.today/guwerljayn.pdfIn PDF document text
    • http://daimontimur.org/rosamagawezodutotedolif39ygi.pdfIn PDF document text
    • http://accueilcmb.com/loguxutofulusuahcw4.pdfIn PDF document text
    • http://xoxosedefoxadu.mygamesonline.org/wepunojetiga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jabodegodonirad.atwebpages.com/air_force_1_white_and_black_junior.pdfIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_e46b11ba262c47b5911a6eb12b6b54b9.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_3448af39dfcf4a17ae25a70ba88cb4db.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_929b545176b1416d9363733a76712f67.pdf?index=trueIn PDF document text
    • http://fiforeru.atwebpages.com/menemopokexojedivenizevos.pdfIn PDF document text
    • http://mixezized.myartsonline.com/banking_current_affairs_2020_june_banking_awareness.pdfIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_e6267e8ada1f4e34946d655ce5134c93.pdf?index=trueIn PDF document text
    • http://bivojeda.atwebpages.com/82121065700.pdfIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_a5d7d8f9575e440d9bd70efcb098516d.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_24e6c2f463ff4a189f29490285fbbac2.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 5488 bytes
SHA-256: b55162b27e1304194d53d553a405cd02a9518edb8f301a18abe9836b5205c97b
font_01_sfnt_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 11912 bytes
SHA-256: 9275d190827794d163f0ecab0fb23ed98cf964f7628c63b7335333a64e109e4d
font_02_sfnt_off0001248e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248E 16088 bytes
SHA-256: 2ead86dc7010c0d141bc66e1505ea24e58b4347c1e24f12d86c97950aa15a31c
font_03_sfnt_off00013958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13958 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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