Malicious PDF — malware analysis report

Static analysis result for SHA-256 72545ea39a7e16c2…

MALICIOUS

PDF

82.1 KB Created: 2021-02-28 22:29:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 2c320e3dbdbf242b8e36db4bda052412 SHA-1: 3b29a6cabafcfcab77b3fbc1cc48eb1490abe437 SHA-256: 72545ea39a7e16c2397ba9e0a4f5de81e436e8360f1b0d241d833b108ab8f4cf
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'segment relationships in circles worksheet answers', aiming to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://kuzutuzo.ru/wix?keyword=segment+relationships+in+circles+worksheet+answers PDF link annotation
    • http://shopmzm.site/tunemawinetudopobadugagph5dr.pdfIn PDF document text
    • http://naderuromopuru.22web.org/fuxosowonumezixo.pdfIn PDF document text
    • http://kewisanoxiv.66ghz.com/asus_aura_z370e.pdfIn PDF document text
    • http://twoup-viktoria.online/libro_el_bardo_thodol39ycv.pdfIn PDF document text
    • https://xurekibovadava.weebly.com/uploads/1/3/0/9/130969225/8e5dd5.pdfIn PDF document text
    • https://fakivafepupu.weebly.com/uploads/1/3/0/8/130873921/zavikuxul_tevitet.pdfIn PDF document text
    • https://putifunefam.weebly.com/uploads/1/3/0/7/130775131/7774741.pdfIn PDF document text
    • http://blognews.top/frigidaire_dishwasher_ultra_quiet_iii_manual0o5u6.pdfIn PDF document text
    • http://setofexperience.site/lingua_latina_pensum_answer_keymrynk.pdfIn PDF document text
    • http://drnextact.xyz/remington_700_sps_tactical_maximum_effective_rangebezfg.pdfIn PDF document text
    • http://sushibara.net/vermiform_appendix_meaningkph01.pdfIn PDF document text
    • https://cdn.sqhk.co/rapalaxob/hfSibid/cinemark_ecuador_guayaquil_mall_del_sur.pdfIn PDF document text
    • https://marejipafikelor.weebly.com/uploads/1/3/1/4/131437604/9339299.pdfIn PDF document text
    • http://navalny.design/sewurozedararebaxilikeijcsn.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/ii89gfG/28573886608.pdfIn PDF document text
    • http://gratoramaa.website/vadewewowelamapixuwuwejuvv3b0h.pdfIn PDF document text
    • https://finazevad.weebly.com/uploads/1/3/0/7/130739247/ponedumufufadi_nemuveje_dugoj.pdfIn PDF document text
    • https://maxijegiv.weebly.com/uploads/1/3/4/1/134131269/xuxisojuvi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wobemiko.epizy.com/50920857748.pdfIn PDF document text
    • http://fofuxolisemaxim.epizy.com/womens_attire_for_formal_wedding.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 5604 bytes
SHA-256: 9dde0df7da7bb856e2f0f3ee86ec2ab14a5b228291f48d0aad4662843704ad0e
font_01_sfnt_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 10568 bytes
SHA-256: d31c0e45a4d53e158387687c0d72e48999047a81f3562de0154c4222dfaff576
font_02_sfnt_off00012598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12598 16100 bytes
SHA-256: 0dd7d0c48dbe061f2ccc5e08a50837d895141c045517d8888a36ebd168e088c7

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